- \({1\over4}-{1\over4}.0,8-{2\over100}\)
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a) \({ {1} \over 3}x + { {2}\over5}(x-1) = 0\)
b)\(|x + { {3} \over 7}|={ {1}\over4} - { {1}\over5}\)
thu gọn biểu thức .........(cái j zợ)................
\(1\dfrac{1}{3}:0,8=\dfrac{2}{3}:\left(0,1\right).x\)
\(\Rightarrow\dfrac{4}{3}:\dfrac{4}{5}=\dfrac{2}{3}:\dfrac{1}{10}.x\)
\(\Rightarrow\dfrac{4}{3}.\dfrac{5}{4}=\dfrac{2}{3}.10x\)
\(\Rightarrow\dfrac{5}{3}=\dfrac{2}{3}.10x\)
\(\Rightarrow10x=\dfrac{5}{3}:\dfrac{2}{3}\)
\(\Rightarrow10x=\dfrac{5}{2}\)
\(\Rightarrow x=\dfrac{5}{2}:10=\dfrac{1}{4}\)
Vậy \(x=\dfrac{1}{4}\)
\(1\dfrac{1}{3}:0,8=\dfrac{2}{3}:0,1x\Rightarrow\dfrac{4}{3}:\dfrac{3}{5}=\dfrac{2}{3}:\dfrac{1}{10}x\)
\(\Rightarrow\dfrac{4}{3}.\dfrac{5}{3}=\dfrac{2}{3}.10x\Rightarrow\dfrac{20}{9}=\dfrac{20}{3}x\Rightarrow x=\dfrac{1}{3}\)
Vậy...................................................
\(\frac{1}{2}x\frac{2}{5}x\frac{1}{5}x0,8x0,25x0,125\)
=\(\frac{1}{2}x\frac{2}{5}x\frac{1}{5}x\frac{4}{5}x\frac{1}{4}x\frac{1}{8}\)
=\(\frac{1x2x1x4x1x1}{2x5x5x5x4x8}\)
=\(\frac{1x1x1x1x1x1}{1x5x5x5x1x8}\)
=\(\frac{1}{1000}\)
\(\frac{1}{2}\times\frac{2}{5}\times\frac{1}{5}\times0,8\times0,25\times0,125\)
\(=0,5\times0,4\times0,2\times0,8\times0,25\times0,125\)
\(=\left(0,5\times0,2\right)\times\left(0,4\times0,25\right)\times\left(0,8\times0,125\right)\)
\(=0,1\times0,1\times0,1\)
\(=0,001\)