chứng minh A=B :
B= 1.2:(1/1/5*1/1/4) trên 0.32+2/25
A=(3 /2/15 + 1/5 ) : 2/1/2 tren (5/3/7 - 2/1/4):4/43/56
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23 tháng 8 2019
\(=\frac{\frac{6}{5}:\left(\frac{6}{5}-\frac{5}{4}\right)}{\frac{8}{25}+\frac{2}{25}}+\frac{\frac{2027}{25}:\frac{9}{4}}{\left(\frac{38}{7}-\frac{9}{4}\right):\frac{267}{56}}\)
\(=\frac{\frac{6}{5}:\left(\frac{-1}{20}\right)}{\frac{2}{5}}+\frac{\frac{8180}{225}}{\frac{89}{28}:\frac{167}{56}}\)
\(=\frac{-12}{5}:\frac{2}{5}+\frac{8180}{225}:\frac{178}{167}\)
\(=-1+...\)ra số to vcl
Đề sai à ???
10 tháng 7 2022
\(A=\dfrac{\left(3+\dfrac{2}{15}+\dfrac{1}{5}\right):\dfrac{5}{2}}{\left(5+\dfrac{3}{7}-2-\dfrac{1}{4}\right):\left(4+\dfrac{43}{56}\right)}\)
\(=\dfrac{\dfrac{10}{3}\cdot\dfrac{2}{5}}{\dfrac{89}{28}:\dfrac{267}{56}}=\dfrac{4}{3}:\dfrac{2}{3}=2\)
\(B=\dfrac{\dfrac{6}{5}:\left(\dfrac{6}{5}\cdot\dfrac{5}{4}\right)}{\dfrac{8}{25}+\dfrac{2}{25}}=\dfrac{\dfrac{6}{5}:\dfrac{3}{2}}{\dfrac{2}{5}}=2\)
Do đó: A=B
VH
3 tháng 8 2018
A = \(\dfrac{\left(\dfrac{47}{15}+\dfrac{3}{15}\right):\dfrac{5}{2}}{\left(\dfrac{38}{7}-\dfrac{9}{4}\right):\dfrac{267}{56}}=\dfrac{\dfrac{10}{3}.\dfrac{2}{5}}{\dfrac{89}{28}.\dfrac{56}{267}}=2\)
B= \(\dfrac{1,2:\left(\dfrac{6}{5}.\dfrac{5}{4}\right)}{0,32+\dfrac{2}{25}}=\dfrac{\dfrac{6}{5}:\dfrac{3}{2}}{\dfrac{8}{25}+\dfrac{2}{25}}=\dfrac{4}{\dfrac{5}{\dfrac{2}{5}}}=2\)
=> A = B
26 tháng 2 2017
\(A=\frac{\left(3\frac{1}{15}+\frac{1}{5}\right):2\frac{1}{2}}{\left(5\frac{3}{7}-2\frac{1}{4}\right):4\frac{43}{56}}=\frac{\left(\frac{46}{15}+\frac{3}{15}\right):\frac{5}{2}}{\left(\frac{38}{7}-\frac{9}{4}\right):\frac{267}{56}}=\frac{\frac{49}{15}.\frac{2}{5}}{\frac{89}{28}.\frac{56}{267}}=\frac{\frac{98}{75}}{\frac{2}{3}}=\frac{49}{25}\)
\(B=\frac{1,2:\left(1\frac{1}{5}.1\frac{1}{4}\right)}{0.32+\frac{2}{5}}=\frac{\frac{6}{5}:\left(\frac{6}{5}.\frac{5}{4}\right)}{\frac{8}{25}+\frac{10}{25}}=\frac{\frac{6}{5}.\frac{4}{6}}{\frac{18}{25}}=\frac{\frac{4}{5}}{\frac{18}{25}}\)
ĐỀ SAI