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14 tháng 10 2017
Erza
a) \(\frac{3}{5}-\frac{1}{3}-\frac{1}{6}=\frac{18}{30}-\frac{10}{30}-\frac{5}{30}=\frac{18-10-5}{30}=\frac{1}{10}\)
b) \(\frac{4}{7}\times\frac{5}{8}\times\frac{7}{12}=\frac{4\times5\times7}{7\times8\times12}=\frac{140}{672}=\frac{5}{24}\)
c) \(\frac{25}{28}\div\frac{15}{14}\times\frac{6}{7}=\frac{25}{28}\times\frac{14}{15}\times\frac{6}{7}=\frac{25\times14\times6}{28\times15\times7}=\frac{2100}{2940}=\frac{5}{7}\)
Thấy đúg thì tk nha các bn !!
14 tháng 10 2017
a,3/5 - 1/3 - 1/6
= 4/9 - 1/6
= 5/9
b,4/7x5/8x7/12
= 5/14 x 7/12
= 5/24
c,25/18 :15/14 x 6/7
= 25/28 x 14/15 x 6/7
= 5/6 x 6/7
= 5/7
A
3 tháng 8 2017
A,\(\frac{7}{13}+\frac{1}{7}+\frac{18}{30}=\frac{49}{91}+\frac{13}{91}+\frac{18}{30}=\frac{62}{91}+\frac{18}{30}=\frac{1860}{2730}+\frac{1638}{2730}=\frac{583}{455}\)
B,\(\left(\frac{20}{21}+\frac{3}{14}\right)-\frac{2}{3}=\left(\frac{280}{294}+\frac{63}{294}\right)-\frac{2}{3}=\frac{7}{6}-\frac{2}{3}=\frac{21}{18}-\frac{12}{18}=\frac{9}{18}=\frac{1}{2}\)
C,\(=\frac{17}{5}+\frac{31}{7}=\frac{119}{35}+\frac{155}{35}=\frac{234}{35}\)
3 tháng 8 2017
(\(\frac{5}{7}-y\)) x \(\frac{14}{5}=\frac{6}{5}\)
\(\frac{5}{7}-y\) = \(\frac{6}{5}:\frac{14}{5}\)
\(\frac{5}{7}-y\) = \(\frac{3}{7}\)
y = \(\frac{5}{7}-\frac{3}{7}\)
y = \(\frac{2}{7}\)
DP
3 tháng 8 2017
\(\left(\frac{5}{7}-y\right)\cdot\frac{14}{5}=\frac{7}{10}+\frac{1}{2}\)
\(\Leftrightarrow\left(\frac{5}{7}-y\right)\cdot\frac{14}{5}=\frac{7}{10}+\frac{5}{10}\)
\(\Leftrightarrow\left(\frac{5}{7}-y\right)\cdot\frac{14}{5}=\frac{6}{5}\)
\(\Leftrightarrow\frac{5}{7}-y=\frac{6}{5}\div\frac{14}{5}\)
\(\Leftrightarrow\frac{5}{7}-y=\frac{3}{7}\)
\(\Rightarrow y=\frac{5}{7}-\frac{3}{7}=\frac{2}{7}\)
4 tháng 8 2019
a)<=>2/7:(13/24+5/24) b)<=>15/24-9/24-4/24 c)=7.5.39/13.14.15
<=>2/7:3/4 <=>2/24=1/12 =3/2.3
<=>2/7x4/3 =1/2
<=>8/21
4 tháng 8 2019
a. \(\frac{2}{7}:\frac{13}{24}+\frac{2}{7}:\frac{5}{24}\)
= \(\frac{2}{7}:\left(\frac{13}{24}+\frac{5}{24}\right)\)
= \(\frac{2}{7}:\frac{3}{4}\)
= \(\frac{8}{21}\)
b. \(\frac{15}{24}-\frac{3}{8}-\frac{1}{6}\)
= \(\frac{15}{24}-\frac{9}{24}-\frac{4}{24}\)
= \(\frac{2}{24}=\frac{1}{12}\)
c. \(\frac{7}{13}.\frac{5}{14}.\frac{39}{15}\)
= \(\frac{7.5.3.13}{13.2.7.3.5}\)
= \(\frac{1}{2}\)
14 tháng 10 2016
a) x - 5/7 - 13/14 =1 b) 3/5 + x+1/1/5 = 11/3
x -5/7 = 1+13/14 3/5+x+6/5=11/3
x - 5/7 = 27/14 3/5+x=11/3 - 6/5
x= 27/14+5/7 3/5+x=37/15
x=27/14+10/14 x=37/15 - 3/5
x=37/14 x=37/15 - 9/15
x=28/15
\(\frac{3}{7}\)+ \(\frac{1}{7}\): x = \(\frac{7}{14}\)
\(\frac{1}{7}\): x = \(\frac{7}{14}\)- \(\frac{3}{7}\)
\(\frac{1}{7}\): x = \(\frac{1}{14}\)
x = \(\frac{1}{7}\): \(\frac{1}{14}\)
x = 2
\(\frac{1}{7}:x=\frac{7}{14}-\frac{3}{7}\)
\(\frac{1}{7}:x=\frac{1}{14}\)
\(x=\frac{1}{14}.\frac{1}{7}\)
\(x=\frac{1}{98}\)
Chúc bạn học tốt
\(\frac{3}{7}+\frac{1}{7}:x=\frac{7}{14}\)
\(\frac{3}{7}+\frac{1}{7}:x=\frac{1}{2}\)
\(\frac{1}{7}:x=\frac{1}{14}\)
\(x=2\)
\(\frac{3}{7}+\frac{1}{7}:x=\frac{7}{14}\)
\(\Rightarrow\frac{3}{7}+\frac{1}{7}:x=\frac{1}{2}\)
\(\Rightarrow\frac{1}{7}:x=\frac{1}{2}-\frac{3}{7}\)
\(\Rightarrow\frac{1}{7}:x=\frac{1}{14}\)
\(\Rightarrow x=\frac{1}{7}:\frac{1}{14}\)
\(\Rightarrow x=2\)
Vậy x = 2
_Chúc bạn học tốt_
3/7 + 1/7 : x = 7/14
3/7 + 1/7 : x = 1/2
1/7 : x = 1/2 - 3/7
1/7 : x= 1/14
x = 1/7 : 1/14
x = 1/7 × 14
x = 2
\(\frac{3}{7}\)\(+\)\(\frac{1}{7}\)\(:\)\(x=\)\(\frac{7}{14}\)
\(\frac{1}{7}\):\(x\)\(=\)\(\frac{7}{14}\)\(-\)\(\frac{3}{7}\)
\(\frac{1}{7}\)\(:x\)\(=\)\(\frac{1}{14}\)
\(x=\) \(\frac{1}{14}\)x \(\frac{1}{7}\)
\(x=\) \(\frac{1}{98}\)
\(\frac{3}{7}+\frac{1}{7}\div x=\frac{7}{14}\)
\(\Rightarrow\frac{1}{7}\div x=\frac{7}{14}-\frac{3}{7}\)
\(\Rightarrow\frac{1}{7}\div x=\frac{1}{4}\)
\(\Rightarrow x=\frac{1}{7}\div\frac{1}{4}\)
\(\Rightarrow x=\frac{4}{7}\)
\(\frac{1}{7}:x=\frac{7}{14}-\frac{3}{7}\)
\(\frac{1}{7}:x=\frac{1}{14}\)
\(x=\frac{1}{7}:\frac{1}{14}\)
\(x=2\)
Trả lời:
\(\frac{3}{7}+\frac{1}{7}:x=\frac{7}{14}\)
\(\frac{1}{7}:x=\frac{7}{14}-\frac{3}{7}\)
\(\frac{1}{7}:x=\frac{1}{14}\)
\(x=\frac{1}{7}:\frac{1}{14}\)
\(x=2\)
Hc tốt #