Question

[Dư Thị Hoa]

tính bằng cách thuận tiện nhất

1\(\frac{1}{2}\)x1\(\frac{1}{3}\):1\(\frac{1}{4}\):1\(\frac{1}{5}\)

Answer 1

[I don't need you]

\(1\frac{1}{2}x1\frac{1}{3}:1\frac{1}{4}:1\frac{1}{5}\)

\(=\frac{3}{2}x\frac{4}{3}:\frac{5}{4}:\frac{6}{5}\)

\(=\frac{3}{2}x\frac{4}{3}x\frac{4}{5}x\frac{5}{6}\)

\(=\frac{4x4}{2x6}=\frac{2x2x4}{2x2x3}=\frac{4}{3}\)

Answer 2

[Dương Lam Hàng]

\(1\frac{1}{2}\times1\frac{1}{3}\div1\frac{1}{4}\div1\frac{1}{5}=\frac{3}{2}\times\frac{4}{3}\div\frac{5}{4}\div\frac{6}{5}=\frac{3}{2}\times\frac{4}{3}\times\frac{4}{5}\times\frac{5}{6}\)

                                           \(=\frac{3\times4\times4\times5}{2\times3\times5\times6}=\frac{4}{3}\)