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a) \(\frac{5}{6}+\frac{7}{12}-\frac{2}{3}\)=\(\frac{10}{12}+\frac{7}{12}-\frac{8}{12}\)=\(\frac{9}{12}=\frac{3}{4}\)
b) \(\frac{3}{4}-1\frac{1}{2}+50\%:\frac{5}{12}\)=\(\frac{3}{4}-\frac{3}{2}+\frac{1}{2}:\frac{5}{12}\)=\(\frac{3}{4}-\frac{3}{2}+\frac{6}{5}\)=\(\frac{30}{40}-\frac{60}{40}+\frac{48}{40}\)= \(\frac{18}{40}\)=\(\frac{9}{20}\)
c)ghi lại đề hộ mk, mk ko rõ
\(a,\frac{5}{6}+\frac{7}{12}-\frac{2}{3}\)
\(=\frac{10}{12}+\frac{7}{12}-\frac{8}{12}\)
\(=\frac{10+7-8}{12}\)
\(=\frac{9}{12}\)
\(=\frac{3}{4}\)
\(b,\frac{3}{4}-1\frac{1}{2}+50\%:\frac{5}{12}\)
\(=\frac{3}{4}-\frac{3}{2}+\frac{1}{2}:\frac{5}{12}\)
\(=\frac{3}{4}-\frac{6}{4}+\frac{1}{2}.\frac{12}{5}\)
\(=\frac{-3}{4}+\frac{6}{5}\)
\(=\frac{-15}{20}+\frac{24}{20}\)
\(=\frac{9}{20}\)
\(c,\frac{2}{7}.5\frac{1}{4}-\frac{2}{7}.3\frac{1}{4}\)
\(=\frac{2}{7}.\left(5\frac{1}{4}-3\frac{1}{4}\right)\)
\(=\frac{2}{7}.\left[\left(5-3\right)+\left(\frac{1}{4}-\frac{1}{4}\right)\right]\)
\(=\frac{2}{7}\left[2+0\right]\)
\(=\frac{2}{7}.2\)
\(=\frac{4}{7}\)
~Study well~
Số hạng trên là
( 1000 - 10 ) : 10 + 1 = 100 số hạng
Tổng trên là
( 1000 + 10 ) x 100 : 2 = 50500
Đáp số : 50500
\(\dfrac{1}{2}+\dfrac{3}{4}-\left(\dfrac{3}{4}-\dfrac{4}{5}\right)\)
=\(\dfrac{1}{2}+\dfrac{3}{4}-\dfrac{3}{4}+\dfrac{4}{5}\)
=\(\left(\dfrac{1}{2}+\dfrac{4}{5}\right)+\left(\dfrac{3}{4}-\dfrac{3}{4}\right)\)
=\(\left(\dfrac{5}{10}+\dfrac{8}{10}\right)+0\)
=\(\dfrac{13}{10}\)
\(-\dfrac{7}{25}.\dfrac{11}{13}+\left(-\dfrac{7}{25}\right).\dfrac{2}{13}-\dfrac{18}{25}\)
=\(-\dfrac{7}{25}.\cdot\left(\dfrac{11}{13}+\dfrac{2}{13}\right)-\dfrac{18}{25}\)
=\(-\dfrac{7}{25}.1-\dfrac{18}{25}\)
=\(-\dfrac{7}{25}-\dfrac{18}{25}\)
=\(-\dfrac{25}{25}\) = \(-1\)
a) 9/4
b)-18/40
a)2,25
b)-0.45
c)6,25
GIẢI:A)\(\frac{3}{4}+\frac{2}{5}:\frac{4}{15}=\frac{3}{4}+\frac{3}{2}=\frac{18}{8}=\frac{9}{4}\)
B)\(\frac{-2}{5}+\frac{7}{10}-\frac{3}{4}=\frac{-8}{20}+\frac{14}{20}+\frac{15}{20}=\frac{21}{20}\)
fan BTS sai rồi kia câu b phép cuối là phép trừ mà
a)3/4+2/5:4/15
=3/4+2/5.15/4
=3/4+3/2
=9/4
b)-2/5+7/10-3/4
=3/10-3/4
=9/20
c)50%+0,75-5/3:(-2/3)2
=50/100+75/100-5/3.(-3/2)2
=50/100+75/100-(-5/2)2
=1/2+3/4-(-10/2)
=1/2+3/4+10/2
=25/4
(hông bit làm đúng không nữa)
:(
\(50\%+0,75-\frac{5}{3}:\left(\frac{-2}{3}\right).2=\frac{1}{2}+\frac{1}{3}-\frac{5}{3}:\frac{-4}{3}=\frac{1}{2}+\frac{1}{3}+\frac{5}{4}=\frac{21}{12}\)
Ngôk Kb vs mk nha