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a, \(\frac{12}{25}+\frac{3}{5}+\frac{13}{25}\)
\(=\left(\frac{12}{25}+\frac{13}{25}\right)+\frac{3}{5}\)
\(=1+\frac{3}{5}\)
\(=\frac{8}{5}\)
b, \(\frac{3}{2}+\frac{2}{3}+\frac{4}{3}\)
\(=\frac{3}{2}+\left(\frac{2}{3}+\frac{4}{3}\right)\)
\(=\frac{3}{2}+2\)
\(=\frac{7}{2}\)
c, \(\frac{3}{5}+\frac{7}{5}+\frac{3}{4}\)
\(=2+\frac{3}{4}\)
\(=\frac{11}{4}\)
nhớ ấn đúng giùm tớ nha
a) = 8 phần 5
b) = 7 phần 2
c) = 11 phần 4
nhớ ấn giùm tớ nha
\(\frac{4}{5}+\frac{2}{7}+\frac{11}{5}+\frac{12}{7}+\frac{1}{5}\)
\(=\frac{4}{5}+\frac{11}{5}+\frac{1}{5}+\frac{2}{7}+\frac{12}{7}\)
\(=\frac{4+11+1}{5}+\frac{2+12}{7}\)
\(=\frac{16}{5}+\frac{14}{7}\)
\(=\frac{16}{5}+2=\frac{26}{5}\)
\(\frac{4}{5}+\frac{2}{7}+\frac{11}{5}+\frac{12}{7}+\frac{1}{5}\)
\(=\left(\frac{4}{5}+\frac{11}{5}+\frac{1}{5}\right)+\left(\frac{2}{7}+\frac{12}{7}\right)\)
\(=\frac{16}{5}+\frac{14}{7}\)
\(=\frac{16}{5}+2=\frac{16}{5}+\frac{10}{5}=\frac{26}{5}\)
\(\frac{12}{25}=0,4800\)
\(\frac{7}{5}=1,4000\)
\(\frac{13}{4}=3,2500\)
a ) 9/7 x 5/12 + 9/7 x 11/12
= 9/7 x (5/12 + 11/12)
= 9/7 x 4/3
= 2/7 x 4
= 8/7
b) 7/4 x 25/13 - 5/13 x 7/4
= 7/4 x (25/13 - 5/13)
= 7/4 x 20/13
= 7 x 5/13
= 35/13
help toi voi
a, 9/7 x 5/12 + 9/7 x 11/12
= 9/7 x ( 5/12 + 1/12 )
= 9/7 x 1/2
= 9/14
Chết nhầm kia phải là 11 789000 làm đúng rùi nhé tui sai .
\(\dfrac{9}{7}x\dfrac{5}{12}+\dfrac{9}{7}x\dfrac{11}{12}\)
= \(\dfrac{9}{7}x\left(\dfrac{5}{12}+\dfrac{11}{12}\right)\)
= \(\dfrac{9}{7}x\dfrac{4}{3}\)
= \(\dfrac{12}{7}\)
b) \(\dfrac{7}{4}x\dfrac{25}{13}-\dfrac{5}{13}x\dfrac{7}{4}\)
=\(\dfrac{7}{4}x\left(\dfrac{25}{13}-\dfrac{5}{13}\right)\)
= \(\dfrac{7}{4}x\dfrac{20}{13}\)
= \(\dfrac{35}{13}\)