\(\frac{4}{5}.7-0,8^2+1,25.7-\frac{4}{5}.1,25\)
Những câu hỏi liên quan
cho: A= [ 0,8.7+(0,8)^2] . (1,25.7 - 4/5 . 1,25) + 31,64,.
B=\(\frac{\text{(1,09-0,29) .5/4}}{\frac{\left(18,9-16,65\right).\frac{8}{9}}{ }}\)Hỏi A gấp mấy lần B
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=\(\frac{\left(1,09-0,29\right).\frac{5}{4}}{\left(18,9-16,65\right).\frac{8}{9}}\)
\(A=\frac{0,87.7+0,8^2}{\left(1,25.7-\frac{4}{5}.1,25\right)+31,64}\)
\(A=\frac{0,87\left(7+0,8\right)}{\left[1,25\left(7-\frac{4}{5}\right)\right]+31,64}\)
\(A=\frac{6,786}{7,75+31,64}\)
\(A=\frac{87}{505}\)
\(B=\frac{\left(1,09-0,29\right).\frac{5}{4}}{\left(18,9-16,65\right).\frac{8}{9}}\)
\(B=\frac{0,8.\frac{5}{4}}{2,25.\frac{8}{9}}\)
\(B=\frac{1}{2}\)
A gấp B số lần là:\(\frac{87}{505}:\frac{1}{2}=\frac{174}{505}\)
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\(choA=\left[0,8.7+\left(0,8\right)^2\right]. \left(1,25.7-\frac{4}{5}.1,25\right)+31,64\)
\(B=\frac{\left(1,09-0,29\right).\frac{5}{4}}{\left(18,9-16,65\right).\frac{8}{9}}\)
Hỏi A gấp mấy lần B ?
TINH GIA TRI BIEU THUC SAU ; C=[0,8.7+(0,8)2].(1,25.7-\(\frac{4}{5}\).1,25)+31,64
\(ChoA=\left[0,8.7+\left(0,8\right)^2\right]\left(1,25.7-\frac{4}{5}.1,25\right)+31,64\)
\(B=\frac{\left(1.09-0.29\right).\frac{5}{4}}{\left(18.9-16.65\right).\frac{8}{9}}\)
Hỏi A gấp mấy lần B?
\(A=\left[0,8.7\left(0,8\right)^2\right].\left(1,25.7-\frac{4}{5}.1,25\right)+31,64\)
\(=0,8.\left(7+0,8\right).1,25.\left(7-0,8\right)+31,64\)
\(=0,8.7,8.1,25.6,2+31,64\)
\(=6,24.7,75+31,64\)
\(=48,36+31,64=80\)
\(B=\frac{\left(1,09-0,29\right).\frac{5}{4}}{\left(18,9-16,65\right).\frac{8}{9}}=\frac{0,8.1,25}{2,25.\frac{8}{9}}=\frac{1}{2}\)
\(A:B=80:\frac{1}{2}=160\)
Vậy A gấp 160 lần B.
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Cho A = \(\left[0,8.7+\left(0,8\right)^2\right]\left(1,25.7-\frac{4}{5}.1,25\right)+31,64\)
B = \(\frac{\left(1,09-0,29\right).\frac{5}{4}}{\left(18,9-16,65\right).\frac{8}{9}}\)
Hỏi A gấp B bao nhiêu lần?
A= ( 0,8.7+0,82)(1,25.7-\(\frac{4}{5}\).1,25)+31,64
B=\(\frac{\left(11,81+8,19\right).0,02}{9:11,25}\)
So sánh A và B số nào lớn hơn và lớn hơn bao nhiêu?
Tính A = [ \(0,8.7+\left(0,8\right)^2\)] [\(1,25.7-\frac{4}{5}.1,25\)] + 31,64
B = \(\frac{\left(1,09-0,29\right).\frac{5}{4}}{\left(18,9-16,65\right).\frac{8}{9}}\)
Hỏi A gấp mấy lần B
Bài 7: Tính giá trị biểu thức:
a) A = \(\left(\frac{\frac{1}{4}-\frac{1}{4}+\frac{1}{9}}{\frac{1}{9}}\right):\left(\frac{\frac{2}{3}+\frac{7}{15}}{\frac{2}{5}-\frac{1}{6}}\right)\)
b) B = (0,8.7+0,64).(1,25.7-\(\frac{4}{6}\).1,25) +31,64
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: \(=\left(5.6+0.64\right)\cdot1.25\cdot\dfrac{19}{3}+31.64\)
\(=\dfrac{39}{5}\cdot\dfrac{19}{3}+\dfrac{791}{25}=\dfrac{2026}{25}\)
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