Question

[vu thi kim an]

tính bằng cách thuận tiện nhất 

17/2 nhan3/5 + 3/5 nhân 1/2 + 3/5

Answer 1

[Arima Kousei]

\(\frac{1}{7}x\frac{3}{5}+\frac{3}{5}x\frac{1}{2}+\frac{3}{5}\)

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

\(=\frac{3}{5}x\left(\frac{2}{14}+\frac{7}{14}+\frac{14}{14}\right)\)

\(=\frac{3}{5}x\frac{23}{14}\)

\(=\frac{69}{70}\)

Tham khảo nha !!!