Tính
(0,8.7+0,82).(1,25.7-\(\dfrac{4}{5}\).1,25)+31,64
K
Khách
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
Những câu hỏi liên quan
CB
0
8 tháng 6 2017
Ta có :
A = \(\left[0,8.7+\left(0,8\right)^2\right].\left(1,25.7-\dfrac{4}{5}.1,25\right)+31,64\)
A = \(\left[0,8.\left(7+0,8\right)\right].\left[1,25.\left(7-\dfrac{4}{5}\right)\right]+31,64\)
A = \(\left(0,8.7,8\right)\left(1,25.6,2\right)+31,64\)
A = 6,24 . 7,75 + 31,64
A = 48,36 + 31,64
A = 80
B = \(\dfrac{\left(1,09-1,29\right).\dfrac{5}{4}}{\left(18,9-16,25\right).\dfrac{8}{9}}\)
B= \(\dfrac{\dfrac{4}{5}.\dfrac{5}{4}}{\dfrac{9}{4}.\dfrac{8}{9}}\)
B = \(\dfrac{1}{2}\)
Vậy A gấp B : 80 :\(\dfrac{1}{2}\) = 160 (lần)
26 tháng 6 2017
\(A=\frac{0,87.7+0,8^2}{\left(1,25.7-\frac{4}{5}.1,25\right)+31,64}\)
\(A=\frac{0,87\left(7+0,8\right)}{\left[1,25\left(7-\frac{4}{5}\right)\right]+31,64}\)
\(A=\frac{6,786}{7,75+31,64}\)
\(A=\frac{87}{505}\)
\(B=\frac{\left(1,09-0,29\right).\frac{5}{4}}{\left(18,9-16,65\right).\frac{8}{9}}\)
\(B=\frac{0,8.\frac{5}{4}}{2,25.\frac{8}{9}}\)
\(B=\frac{1}{2}\)
A gấp B số lần là:\(\frac{87}{505}:\frac{1}{2}=\frac{174}{505}\)
EV
4 tháng 7 2016
\(A=\left[0,8.7\left(0,8\right)^2\right].\left(1,25.7-\frac{4}{5}.1,25\right)+31,64\)
\(=0,8.\left(7+0,8\right).1,25.\left(7-0,8\right)+31,64\)
\(=0,8.7,8.1,25.6,2+31,64\)
\(=6,24.7,75+31,64\)
\(=48,36+31,64=80\)
\(B=\frac{\left(1,09-0,29\right).\frac{5}{4}}{\left(18,9-16,65\right).\frac{8}{9}}=\frac{0,8.1,25}{2,25.\frac{8}{9}}=\frac{1}{2}\)
\(A:B=80:\frac{1}{2}=160\)
Vậy A gấp 160 lần B.
5 tháng 2 2022
a: \(A=\dfrac{1}{9}:\dfrac{1}{9}:\left(\dfrac{10+7}{15}:\dfrac{12-5}{30}\right)\)
\(=1:\left(\dfrac{17}{15}\cdot\dfrac{30}{7}\right)=1:\dfrac{34}{7}=\dfrac{7}{34}\)
b: \(=\left(5.6+0.64\right)\cdot1.25\cdot\dfrac{19}{3}+31.64\)
\(=\dfrac{39}{5}\cdot\dfrac{19}{3}+\dfrac{791}{25}=\dfrac{2026}{25}\)
10 tháng 2 2022
a: \(A=\left(0+1\right):\left(\dfrac{2}{3}+\dfrac{7}{6}-\dfrac{1}{6}\right)=1:\dfrac{5}{3}=\dfrac{3}{5}\)
b: \(B=\left[0.8\cdot15\right]\cdot\left[1.25\cdot\dfrac{19}{3}\right]+31.64=15\cdot\dfrac{95}{12}+31.64=150.39\)
(0,8.7 + 0,82).( 1,25.7 - \(\dfrac{4}{5}\).1,25)+31,64
=0,8(7+0,8).[ 1,25.(7-0,8) + 31,64
=0,8.1,25.7,8.6.2 + 31,64
= 48,36 + 31,64
= 80