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\(x:3+35=45\)
\(x:3=45-35\)
\(x:3=10\)
\(x=10\times3\)
\(x=30\)
\(a,\left(\dfrac{3}{5}+\dfrac{2}{5}\right)+\left(\dfrac{4}{7}+\dfrac{1}{7}+\dfrac{2}{7}\right)=1+1=2\)
\(b,\left(\dfrac{1}{3}+\dfrac{4}{3}+\dfrac{2}{3}\right)+\left(\dfrac{1}{6}+\dfrac{2}{6}+\dfrac{5}{6}\right)=\dfrac{7}{3}+\dfrac{4}{3}=\dfrac{11}{3}\)
a)\(\dfrac{3}{5}+\dfrac{4}{7}+\dfrac{2}{5}+\dfrac{1}{7}+\dfrac{2}{7}\)
\(=\left(\dfrac{3}{5}+\dfrac{2}{5}\right)+\left(\dfrac{4}{7}+\dfrac{1}{7}+\dfrac{2}{7}\right)\)
\(=1+1\)
\(=2\)
b)\(\dfrac{1}{3}+\dfrac{1}{6}+\dfrac{4}{3}+\dfrac{2}{6}+\dfrac{2}{3}+\dfrac{5}{6}\)
\(=\left(\dfrac{1}{3}+\dfrac{4}{3}+\dfrac{2}{3}\right)+\left(\dfrac{1}{6}+\dfrac{2}{6}+\dfrac{5}{6}\right)\)
\(=\dfrac{7}{3}+\dfrac{4}{3}\)
\(=\dfrac{11}{3}\)
3/5 + 2 = 3/5 + 10/5 = 13/5
3 + 1/4 = 12/4 + 1/4 = 13/4
5/12 + 3/8 = 10/24 + 8/24 = 18/24 = 3/4
11/10 + 1/2 = 11/10 + 5/10 = 16/10 = 8/5
\(=\dfrac{145\cdot100-143\cdot100}{100\cdot113-100\cdot112}=2\)
số gạo nếp là :
240 : ( 7 - 3 ) x 3 = 180 ( kg )
số gạo tẻ là :
240 : ( 7 - 3 ) x 7 = 420 ( kg )
đou?
:v?