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1. \(A=\dfrac{2\left(\dfrac{1}{5}+\dfrac{1}{7}-\dfrac{1}{9}-\dfrac{1}{11}\right)}{4\left(\dfrac{1}{5}+\dfrac{1}{7}-\dfrac{1}{9}-\dfrac{1}{11}\right)}=\dfrac{2}{4}=\dfrac{1}{2}\)
2. \(B=\dfrac{1^2.2^2.3^2.4^2}{1.2^2.3^2.4^2.5}=\dfrac{1}{5}\)
3.\(C=\dfrac{2^2.3^2.\text{4^2.5^2}.5^2}{1.2^2.3^2.4^2.5.6^2}=\dfrac{125}{36}\)
4.D=\(D=\left(\dfrac{4}{5}-\dfrac{1}{6}\right).\dfrac{4}{9}.\dfrac{1}{16}=\dfrac{19}{30}.\dfrac{1}{36}=\dfrac{19}{1080}\)
A,
\(\left(7\dfrac{4}{9}+3\dfrac{7}{11}\right)-3\dfrac{4}{9}=7\dfrac{4}{9}+3\dfrac{7}{11}-3\dfrac{4}{9}\)
\(=7\dfrac{4}{9}-3\dfrac{4}{9}+3\dfrac{7}{11}=4+3\dfrac{7}{11}=7\dfrac{7}{11}\)
B,
\(5\dfrac{2}{7}.\dfrac{8}{11}+5\dfrac{2}{7}.\dfrac{5}{11}-5\dfrac{2}{7}.\dfrac{2}{11}=5\dfrac{2}{7}.\left(\dfrac{8}{11}+\dfrac{5}{11}-\dfrac{2}{11}\right)\)
\(=5\dfrac{2}{7}.1=5\dfrac{2}{7}\)
a) \(1-\dfrac{1}{2}+\dfrac{1}{3}=\dfrac{6}{6}-\dfrac{3}{6}+\dfrac{2}{6}=\dfrac{6-3+2}{6}=\dfrac{1}{6}\)
\(b.\) \(\dfrac{2}{5}+\dfrac{3}{5}:\dfrac{9}{10}=\dfrac{2}{5}+\dfrac{3}{5}.\dfrac{10}{9}=\dfrac{2}{5}+\dfrac{2}{3}=\dfrac{6}{15}+\dfrac{10}{15}=\dfrac{6+10}{15}=\dfrac{16}{15}\)
\(c.\) \(\dfrac{7}{11}.\dfrac{3}{4}+\dfrac{7}{11}.\dfrac{1}{4}+\dfrac{4}{11}=\dfrac{21}{44}+\dfrac{7}{44}+\dfrac{4}{11}=\dfrac{21}{44}+\dfrac{7}{44}+\dfrac{16}{44}=\dfrac{21+7+16}{44}=\dfrac{44}{44}=1\)
a/\(1-\dfrac{1}{2}+\dfrac{1}{3}=\dfrac{6}{6}-\dfrac{3}{6}+\dfrac{2}{6}=\dfrac{5}{6}\)
b/\(\dfrac{2}{5}+\dfrac{3}{5}:\dfrac{9}{10}=\dfrac{2}{5}+\dfrac{3}{5}.\dfrac{10}{9}=\dfrac{2}{5}+\dfrac{2}{3}=\dfrac{6}{15}+\dfrac{10}{15}=\dfrac{16}{15}\)
a: \(\dfrac{-1}{2}+\dfrac{5}{6}+\dfrac{1}{3}\)
\(=\dfrac{-3}{6}+\dfrac{5}{6}+\dfrac{2}{6}\)
\(=\dfrac{4}{6}=\dfrac{2}{3}\)
b: \(\dfrac{-3}{8}+\dfrac{7}{4}-\dfrac{1}{12}\)
\(=\dfrac{-9}{24}+\dfrac{42}{24}-\dfrac{2}{24}\)
\(=\dfrac{31}{24}\)
c: \(\dfrac{3}{5}:\left(\dfrac{1}{4}\cdot\dfrac{7}{5}\right)=\dfrac{3}{4}:\dfrac{7}{20}=\dfrac{3}{4}\cdot\dfrac{20}{7}=\dfrac{15}{7}\)
d: \(\dfrac{10}{11}+\dfrac{4}{11}:4-\dfrac{1}{8}\)
\(=\dfrac{10}{11}+\dfrac{1}{11}-\dfrac{1}{8}=\dfrac{7}{8}\)
Bài 1:
\(a,=\frac{2}{3}-\frac{16}{3}=\frac{-14}{3}\)
\(b,=\left(\frac{3}{7}+\frac{4}{7}\right)+\left(-\frac{6}{19}+\frac{-13}{19}\right)=1-1=0\)
\(c,=\frac{3}{5}.\left(\frac{8}{9}-\frac{7}{9}+\frac{26}{9}\right)=\frac{3}{5}.3=\frac{9}{5}\)
a,\(\dfrac{1}{2}\).\(\dfrac{4}{3}\)-\(\dfrac{20}{3}\).\(\dfrac{4}{5}\)=\(\dfrac{2}{3}\)-\(\dfrac{16}{3}\)=-\(\dfrac{14}{3}\)
Mik làm Bài 2 nhé ~
Bài 2 :
a) \(x-\dfrac{1}{2}=-\dfrac{1}{10}\)
\(x=-\dfrac{1}{10}+\dfrac{1}{2}\)
\(x=\dfrac{2}{5}\)
b) \(\dfrac{2}{3}x-\dfrac{7}{6}=\dfrac{5}{2}\)
\(\dfrac{2}{3}x=\dfrac{5}{2}+\dfrac{7}{6}\)
\(\dfrac{2}{3}x=\dfrac{11}{3}\)
\(x=\dfrac{11}{3}:\dfrac{2}{3}\)
\(x=\dfrac{11}{3}.\dfrac{3}{2}\)
\(x=\dfrac{11}{2}\)
c) \(2,5-\left(\dfrac{1}{8}x+\dfrac{1}{2}\right)=\dfrac{3}{4}\)
\(\left(\dfrac{1}{8}x+\dfrac{1}{2}\right)=2,5-\dfrac{3}{4}\)
\(\left(\dfrac{1}{8}x+\dfrac{1}{2}\right)=\dfrac{5}{2}-\dfrac{3}{4}\)
\(\dfrac{1}{8}x+\dfrac{1}{2}=\dfrac{7}{4}\)
\(\dfrac{1}{8}x=\dfrac{7}{4}-\dfrac{1}{2}\)
\(\dfrac{1}{8}x=\dfrac{5}{4}\)
\(x=10\)
Bài 1:
a) \(\dfrac{-4}{11}.\dfrac{7}{9}+\dfrac{-4}{11}.\dfrac{2}{9}-\dfrac{7}{11}\)
\(=\dfrac{-4}{11}.\left(\dfrac{7}{9}+\dfrac{2}{9}\right)-\dfrac{7}{11}\)
\(=\dfrac{-4}{11}.1-\dfrac{7}{11}\)
\(=\dfrac{-4}{11}-\dfrac{7}{11}\)
\(=-1\)
b) \(\dfrac{3}{5}:\dfrac{-7}{10}+0,5-\left(\dfrac{-9}{14}\right)\)
\(=\dfrac{-6}{7}+\dfrac{1}{2}+\dfrac{9}{14}\)
\(=\dfrac{2}{7}\)
c) \(\dfrac{3}{5}-\dfrac{8}{5}:\left(5,25+75\%\right)\)
\(=\dfrac{3}{5}-\dfrac{8}{5}:\left(\dfrac{21}{4}+\dfrac{3}{4}\right)\)
\(=\dfrac{3}{5}-\dfrac{8}{5}:6\)
\(=\dfrac{3}{5}-\dfrac{4}{15}\)
\(=\dfrac{1}{3}\)
a: =11+3/4-6-5/6+4+1/2+1+2/3
=10+9/12-10/12+6/12+8/12
=10+13/12=133/12
b: \(=2+\dfrac{17}{20}-1-\dfrac{11}{15}+2+\dfrac{3}{20}\)
=3-11/15
=34/15
c: \(=\dfrac{31}{7}:\left(\dfrac{7}{5}\cdot\dfrac{31}{7}\right)\)
\(=\dfrac{31}{7}:\dfrac{31}{5}=\dfrac{5}{7}\)
d: \(=\dfrac{29}{8}\cdot\dfrac{36}{29}\cdot\dfrac{15}{23}\cdot\dfrac{23}{5}=\dfrac{9}{2}\cdot3=\dfrac{27}{2}\)
\(\dfrac{-5}{9}+1\dfrac{5}{9}.\left(\dfrac{3}{4}-\dfrac{2}{5}\right):7^2\\ =\dfrac{-5}{9}+\dfrac{14}{9}.\left(\dfrac{3}{4}-\dfrac{2}{5}\right):49\\ =\dfrac{-5}{9}+\dfrac{14}{9}.\left(\dfrac{15}{20}-\dfrac{8}{20}\right):49\\ =\dfrac{-5}{9}+\dfrac{14}{9}.\dfrac{7}{20}:49\\ =\dfrac{-5}{9}+\dfrac{49}{90}:49\\ =\dfrac{-5}{9}+\dfrac{1}{90}\\ =\dfrac{-50}{90}+\dfrac{1}{90}\\ =\dfrac{-49}{90}\)
\(1\dfrac{13}{15}.0,75-\left(\dfrac{104}{195}+25\%\right).\dfrac{24}{47}-3\dfrac{12}{13}:3\\ =\dfrac{28}{15}.\dfrac{3}{4}-\left(\dfrac{8}{15}+\dfrac{1}{4}\right).\dfrac{24}{47}-\dfrac{51}{13}:3\\ =\dfrac{7}{5}-\left(\dfrac{32}{60}+\dfrac{15}{60}\right).\dfrac{24}{47}-\dfrac{51}{13}.\dfrac{1}{3}\\ =\dfrac{7}{5}-\dfrac{47}{60}.\dfrac{24}{47}-\dfrac{17}{13}\\ =\dfrac{7}{5}-\dfrac{2}{5}-\dfrac{17}{13}\\ =1-\dfrac{17}{13}\\ =\dfrac{13}{13}-\dfrac{17}{13}\\ =\dfrac{-4}{13}\)
a) = 1/2 + 1/3 = 5/6
b) = 2/5 + 2/3 = 16/15
c) = 7/11 . ( 3/4 + 1/4 ) + 4/11
= 7/11 . 1 + 4/11
= 7/11 + 4/11
= 1
d) = ( 3/4 + 1/2 + 1/4 ) . 8/3
= 3/2 . 8/3
= 4
1-1/2+1/3=5/6
a)5/6
b)16/15
c)14/11
d)4
a)5/6
b)16/15
c)1
d)4
a) = 1/2 + 1/3 = 5/6
b) = 2/5 + 2/3 = 16/15
c) = 7/11 . ( 3/4 + 1/4 ) + 4/11
= 7/11 . 1 + 4/11
= 7/11 + 4/11
= 1
d) = ( 3/4 + 1/2 + 1/4 ) . 8/3
= 3/2 . 8/3
= 4
a) = 1/2 + 1/3 = 5/6
b) = 2/5 + 2/3 = 16/15
c) = 7/11 . ( 3/4 + 1/4 ) + 4/11
= 7/11 . 1 + 4/11
= 7/11 + 4/11
= 1
d) = ( 3/4 + 1/2 + 1/4 ) . 8/3
= 3/2 . 8/3
= 4
a
=1-3/6+2/6
=1-5/6
=5/6
b
=2/5+3/5.10/9
=2/5+30/45
=2/5+2/3
=6/15+10/15
=16/15
c
=7/11.(3/4+1/4)+4/11
=7/11.1+4/11
=7/11+4/11
=11/11
=1
d
=(3/4+1/2+1/4).8/3
=(6/8+4/8+1/4).8/3
=(10/8+1/4).8/3
=(5/4+1/4).8/3
=6/4.8/3
=3/2.8/3
=8/2
=4/1
=4
a
=1-3/6+2/6
=1-5/6
=5/6
b
=2/5+3/5.10/9
=2/5+30/45
=2/5+2/3
=6/15+10/15
=16/15
c
=7/11.(3/4+1/4)+4/11
=7/11.1+4/11
=7/11+4/11
=11/11
=1
d
=(3/4+1/2+1/4).8/3
=(6/8+4/8+1/4).8/3
=(10/8+1/4).8/3
=(5/4+1/4).8/3
=6/4.8/3
=3/2.8/3
=8/2
=4/1
=4
a) 1\2 + 1\3 = 5\6
b) 2\5 + 3\2 = 19\10
c) 7\11 + 4\11 =1
d) 3\2 x 7\3 =21\6
a) 1−12+13=6−3+26=561−21+31=66−3+2=65.
b) 25+35:910=25+35⋅109=25+23=161552+53:109=52+53⋅910=52+32=1516.
c) 711⋅34+711⋅14+411=711(34+14)+411=711+411=1117⋅43+117⋅41+114
a) 1−12+13=6−3+26=561−21+31=66−3+2=65.
b) 25+35:910=25+35⋅109=25+23=161552+53:109=52+53⋅910=52+32=1516.
c) 711⋅34+711⋅14+411=711(34+14)+411=711+411=1117⋅43+117⋅41+114
a) 1−12+13=6−3+26=561−21+31=66−3+2=65.
b) 25+35:910=25+35⋅109=25+23=161552+53:109=52+53⋅910=52+32=1516.
c) 711⋅34+711⋅14+411=711(34+14)+411=711+411=1117⋅43+117⋅41+114
a) 1−12+13=6−3+26=561−21+31=66−3+2=65.
b) 25+35:910=25+35⋅109=25+23=161552+53:109=52+53⋅910=52+32=1516.
c) 711⋅34+711⋅14+411=711(34+14)+411=711+411=1117⋅43+117⋅41+114
a) 1−12+13=6−3+26=561−21+31=66−3+2=65.
b) 25+35:910=25+35⋅109=25+23=161552+53:109=52+53⋅910=52+32=1516.
c) 711⋅34+711⋅14+411=711(34+14)+411=711+411=1117⋅43+117⋅41+114
a) 1−12+13=6−3+26=561−21+31=66−3+2=65.
b) 25+35:910=25+35⋅109=25+23=161552+53:109=52+53⋅910=52+32=1516.
c) 711⋅34+711⋅14+411=711(34+14)+411=711+411=1117⋅43+117⋅41+114
a) 1−12+13=6−3+26=561−21+31=66−3+2=65.
b) 25+35:910=25+35⋅109=25+23=161552+53:109=52+53⋅910=52+32=1516.
c) 711⋅34+711⋅14+411=711(34+14)+411=711+411=1117⋅43+117⋅41+114
a) 1−12+13=6−3+26=561−21+31=66−3+2=65.
b) 25+35:910=25+35⋅109=25+23=161552+53:109=52+53⋅910=52+32=1516.
c) 711⋅34+711⋅14+411=711(34+14)+411=711+411=1117⋅43+117⋅41+114
a) 1−12+13=6−3+26=561−21+31=66−3+2=65.
b) 25+35:910=25+35⋅109=25+23=161552+53:109=52+53⋅910=52+32=1516.
c) 711⋅34+711⋅14+411=711(34+14)+411=711+411=1117⋅43+117⋅41+114
a) 1−12+13=6−3+26=561−21+31=66−3+2=65.
b) 25+35:910=25+35⋅109=25+23=161552+53:109=52+53⋅910=52+32=1516.
c) 711⋅34+711⋅14+411=711(34+14)+411=711+411=1117⋅43+117⋅41+114
a) 1−12+13=6−3+26=561−21+31=66−3+2=65.
b) 25+35:910=25+35⋅109=25+23=161552+53:109=52+53⋅910=52+32=1516.
c) 711⋅34+711⋅14+411=711(34+14)+411=711+411=1117⋅43+117⋅41+114
a) 1−12+13=6−3+26=561−21+31=66−3+2=65.
b) 25+35:910=25+35⋅109=25+23=161552+53:109=52+53⋅910=52+32=1516.
c) 711⋅34+711⋅14+411=711(34+14)+411=711+411=1117⋅43+117⋅41+114
a) 1−12+13=6−3+26=561−21+31=66−3+2=65.
b) 25+35:910=25+35⋅109=25+23=161552+53:109=52+53⋅910=52+32=1516.
c) 711⋅34+711⋅14+411=711(34+14)+411=711+411=1117⋅43+117⋅41+114
a)1-1/2+1/3= 1-(1/2 + 1/3)= 1-5/6=1/6 c)7/11.3/4+7/11.1/4+4/11=7/11.(3/4+1/4)+4/11=7/11+4/11=1
b) 2/5 + 3/5 : 9/10= 2/5+2/3= 16/15
d)(3/4+0,5+25%) . 2 2/3= ( 0,75 +0,5 +0,25) . 8/3= 1,5.8/3=4
a]5/6
b]16/15
c]1
d]4