Question

cho A=(0,8x7+(0,8)2)(1,25x7-4/5x1,25)+31,64

B=(1,09-0,29)x5/4 /(18,9-16,65)x8/9

Hỏi A gấp mấy lần B?

Answer 1

Ta có:

\(\dfrac{A}{B}=\dfrac{\left[0,8.7+\left(0,8\right)^2\right]\left(1,25.7-\dfrac{4}{5}.1,25\right)+31,64}{\dfrac{\left(1,09-0,29\right).\dfrac{5}{4}}{\left(18,9-16,65\right).\dfrac{9}{8}}}\)

\(\dfrac{A}{B}=\dfrac{\left[0,8\left(7+0,8\right)\right]\left[1,25\left(7-\dfrac{4}{5}\right)\right]+31,64}{\dfrac{0,8.\dfrac{5}{4}}{2,26.\dfrac{9}{8}}}\)

\(\dfrac{A}{B}=\dfrac{6,24.7,75+31,64}{\dfrac{1}{2,53125}}\)

\(\dfrac{A}{B}=\left(48,36+31,64\right).2,53125\)

\(\dfrac{A}{B}=202,5\)

Vậy.............

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