Question

\(\frac{5}{12}\times\frac{2}{3}+\frac{2}{3}\times\frac{7}{12}+\frac{1}{3}\) tính thuận tiện

Answer 1

\(=\frac{2}{3}\)x \(\left(\frac{5}{12}+\frac{7}{12}\right)\)+\(\frac{1}{3}\)

\(=\frac{2}{3}\)x \(1\)+\(\frac{1}{3}\)=  \(\frac{2}{3}+\frac{1}{3}\)=  \(\frac{3}{3}=1\)

Answer 2

= 2/3 x ( 5/12+7/12 ) +1/3

= 2/3 X 1 +1/3 

= 2/3+ 1/3 = 1