Question

[mina]

tính nhanh:

\(\frac{4}{5}\)X \(0,5\)\(+\frac{12}{5}\)X \(0,3+8:10\)X \(0,2\)

Answer 1

[Lê Huỳnh Hà An]

4/5 x 0,5 + 12/5 x 0,3 + 8 : 10 x 0,2

=4/5 x 0,5 + 12/5 x 0,3 + 4/5 x 0,2

=(4/5 + 12/5 + 4/5) x (0,5 + 0.3 + 0,2)

=4 x 1

=4

Answer 2

[Bùi Hoàng Linh Chi]

\(\frac{4}{5}x0,5+\frac{12}{5}x0,3+8:10x0,2=\)\(\frac{4}{5}x0,5+\frac{12}{5}x0,3+\frac{8}{10}x0,2=\)\(\frac{4}{5}x0,5+\frac{12}{5}x0,3+\frac{4}{5}x0,2=\)

\(=\frac{4}{5}x\left(0,5+0,2\right)+\frac{12}{5}x0,3\)\(=\frac{4}{5}x\frac{7}{10}+\frac{12}{5}x0,3=\frac{32}{25}\)