Question

bài 2:tính xem A gấp mấy lần B:

A=\(\frac{\left[0,8.7+0,8^2\right]}{\left(1,25.7-\frac{4}{5}.1,25\right)+31,64}\)

B=\(\frac{\left(1,09-0,29\right).\frac{5}{4}}{\left(18,9-16,65\right).\frac{8}{9}}\)

Answer 1

\(A=\frac{0,87.7+0,8^2}{\left(1,25.7-\frac{4}{5}.1,25\right)+31,64}\)

\(A=\frac{0,87\left(7+0,8\right)}{\left[1,25\left(7-\frac{4}{5}\right)\right]+31,64}\)

\(A=\frac{6,786}{7,75+31,64}\)

\(A=\frac{87}{505}\)

\(B=\frac{\left(1,09-0,29\right).\frac{5}{4}}{\left(18,9-16,65\right).\frac{8}{9}}\)

\(B=\frac{0,8.\frac{5}{4}}{2,25.\frac{8}{9}}\)

\(B=\frac{1}{2}\)

        A gấp B số lần là:\(\frac{87}{505}:\frac{1}{2}=\frac{174}{505}\)