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a. \(\dfrac{656565}{272727}=\dfrac{65}{27}\)
b. \(\dfrac{2}{7}\left(\dfrac{3}{4}+\dfrac{9}{4}\right)=\dfrac{6}{7}\)
4/9 + 11/8 - 5/6 = 32/72 + 99/72 - 60/72 = 32+99-60/72 = 71/72
Ai ngang qua xin để lại 1 l-i-k-e
\(\frac{2}{3}\times\frac{3}{4}\times\frac{4}{5}:\frac{1}{5}\)
\(=\frac{2\times3\times4}{3\times4\times5}:\frac{1}{5}\)
\(=\frac{2}{5}:\frac{1}{5}\)
\(=\frac{2}{5}\times5\)
\(=2\)
\(\frac{3}{4}x\frac{4}{5}:\frac{3}{5}x\frac{6}{7}:\frac{1}{7}x\frac{5}{6}\)\(=\)\(\frac{3}{4}x\frac{4}{5}x\frac{5}{3}x\frac{6}{7}x\frac{7}{1}x\frac{5}{6}\)\(=\)\(\frac{3x4x5x6x7x5}{4x5x3x7x1x6}\)\(=\)\(\frac{\left(3\right)x\left(4\right)x\left(5\right)x\left(6\right)x\left(7\right)x5}{\left(3\right)x\left(4\right)x\left(5\right)x\left(6\right)x\left(7\right)x1}\)\(=\)\(\frac{5}{1}\)\(=\)\(5\).
\(\frac{12}{27}+\frac{5}{8}+\frac{2}{5}+\frac{15}{27}+\frac{3}{5}+\frac{3}{8}\)
\(=\left(\frac{12}{27}+\frac{15}{27}\right)+\left(\frac{5}{8}+\frac{3}{8}\right)+\left(\frac{2}{5}+\frac{3}{5}\right)\)
\(=1+1+1\)
\(=3\)
(12/27+15/27)+(5/8+3/8)+3/5
=1+1+3/5
=2+3/5
=13/5
chúc em học tốt
Ta co : 5/6=50/60 ; 1/2=30/60 ; 2/3=40/60 ; 4/5=48/60
Vi 30/60<40/60<48/60<50/60 hay 1/2<2/3<4/5<5/6
nen sap ep cac phan so theo thu tu tu be den lon la :
1/2 ; 2/3 ; 4/5 ; 5/6 .
a) \(\frac{2}{3}\cdot\frac{1}{5}\cdot x=\frac{1}{3}\)
\(\frac{2}{15}\cdot x=\frac{1}{3}\)
\(x=\frac{1}{3}:\frac{2}{15}\)
\(x=\frac{5}{2}\)
b) \(\frac{3}{4}:3+\frac{1}{4}:3-\frac{1}{5}\)
=\(\left(\frac{3}{4}+\frac{1}{4}\right):3-\frac{1}{5}\)
=\(\frac{1}{3}-\frac{1}{5}\)
=\(\frac{2}{15}\)
Tk mk nha!!!
\(99:\left(\frac{3}{5}-\frac{3}{8}\right)=99:\frac{9}{40}\)
\(=440\)
@ Cừu
\(\dfrac{4}{5}+\dfrac{3}{5}=\dfrac{4+3}{5}=\dfrac{7}{5}\)
7/5