A=[0,8X7+(0,8)2]X(1,25.7-0,8X1,25)+31,64
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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?
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.............
Chúc bạn học tốt!!!
\(A=\frac{0,87.7+0,8^2}{\left(1,25.7-\frac{4}{5}.1,25\right)+31,64}\)
\(A=\frac{0,87\left(7+0,8\right)}{\left[1,25\left(7-\frac{4}{5}\right)\right]+31,64}\)
\(A=\frac{6,786}{7,75+31,64}\)
\(A=\frac{87}{505}\)
\(B=\frac{\left(1,09-0,29\right).\frac{5}{4}}{\left(18,9-16,65\right).\frac{8}{9}}\)
\(B=\frac{0,8.\frac{5}{4}}{2,25.\frac{8}{9}}\)
\(B=\frac{1}{2}\)
A gấp B số lần là:\(\frac{87}{505}:\frac{1}{2}=\frac{174}{505}\)
A=[0,8x7+(0,8)2]x(1,25x7-0,8x1,25)+31,64
A=[0,8x7+0,8x0,8]x(1,25x(7-0,8))+31,64
A=[0,8x(7+0,8)]x(1,25x6,2)+31,64
A=[0,8x7,8]x7,75+31,64
A=6,24x7,75+31,64
A=48,36+31,64
A=80