Question

Thực hiện phép tính : (1/5-9/10):(-5/4)-(1/5+1,6):(-5/4)

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Answer 1

\(\left(\dfrac{1}{5}-\dfrac{9}{10}\right):\dfrac{-5}{4}-\left(\dfrac{1}{5}+1,6\right):\dfrac{-5}{4}\)

= \(\left(\dfrac{1}{5}-\dfrac{9}{10}-\dfrac{1}{5}-1.6\right):\dfrac{-5}{4}\)

= \(\left(-\dfrac{9}{10}-1,6\right):\dfrac{-5}{4}\)

= \(\left(-0.9-1.6\right):\left(-1.25\right)\)

= (-2.5) : (-1.25) = 2

Answer 2

\(\left(\dfrac{1}{5}-\dfrac{9}{10}\right):\left(-\dfrac{5}{4}\right)-\left(\dfrac{1}{5}+1,6\right):\left(-\dfrac{5}{4}\right)\)

\(=\left(\dfrac{1}{5}-\dfrac{9}{10}\right).\left(-\dfrac{4}{5}\right)-\left(\dfrac{1}{5}+1,6\right).\left(-\dfrac{4}{5}\right)\)

\(=\left(-\dfrac{4}{5}\right)\left(\dfrac{1}{5}-\dfrac{9}{10}-\dfrac{1}{5}-1,6\right)\)

\(=-\dfrac{4}{5}.\left(-2,5\right)=2\)

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Answer 3

mk hông có hiểu