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3/5x(2/3-1/5:3/5)
=3/4x(2/3-1/3)
=3/4x1/3=1/4
đúng 100%
\(\frac{3}{4}\cdot\left(\frac{2}{3}-\frac{1}{5}:\frac{3}{5}\right)\)
\(=\frac{3}{4}\cdot\left(\frac{2}{3}-\frac{1}{3}\right)\)
\(=\frac{3}{4}\cdot\frac{1}{3}=\frac{1}{4}\)
a) \(\frac{5}{12}+\frac{5}{6}-\frac{3}{4}=\frac{5}{12}+\frac{10}{12}-\frac{9}{12}=\frac{5+10-9}{12}=\frac{6}{12}=\frac{1}{2}.\)
b) \(1-\left(\frac{1}{5}+\frac{1}{2}\right)=1-\left(\frac{2}{10}+\frac{5}{10}\right)=1-\frac{7}{10}=\frac{3}{10}\)
Chúc bn học tốt !!!
\(3\frac{4}{7}4\frac{2}{5}2\frac{1}{2}\)
\(=\frac{275}{7}\)
\(3\frac{1}{5}+\frac{3}{4}-\frac{1}{2}:\frac{2}{7}=\frac{16}{5}+\frac{3}{4}-\frac{7}{4}=\frac{11}{5}\)
\(3\frac{4}{7}4\frac{2}{5}2\frac{1}{2}=\frac{275}{7}\)
\(3\frac{1}{5}+\frac{3}{4}+\frac{1}{2}:\frac{2}{7}\)
\(=3\frac{1}{5}+\frac{3}{4}+\frac{7}{4}\)
\(=\frac{11}{5}\)
a) 2/9 +1/5 +7/9+4/5
=( 2/9+7/9)+(1/5+4/5)
=1+1=2
b) 1/12+3/16+5/12+5/16
=(1/12 +5/12)+(3/16+5/16)
=1/2 +1/2=1
a)\(\frac{5}{12}:\frac{2}{5}+\frac{7}{12}:\frac{2}{5}-\frac{1}{3}:\frac{2}{5}=\left(\frac{5}{12}+\frac{7}{12}-\frac{1}{3}\right):\frac{2}{5}=\frac{2}{3}:\frac{2}{5}=\frac{5}{3}.\)
b) \(\left(6,7+2,3+5,8\right):1,2=14,8:1,2=\frac{148}{10}:\frac{12}{10}=\frac{148}{12}=\frac{74}{6}=\frac{37}{3}\)
hk tốt!
=25/24 + 35/24 - 5/6
=60/24 - 5/6
=15/6 - 5/6
=15-5/6
=10/6
=5/3
mình chỉ biết í a thôi