Toán Lớp 7: (-1/2)^2√16/25+ √81.(-2/3) ^2-1 và1/2. √4/9
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Toán Lớp 7: (-1/2)^2√16/25+ √81.(-2/3) ^2-1 và1/2. √4/9
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{\left( { – \dfrac{1}{2}} \right)^2}.\sqrt {\dfrac{{16}}{{25}}} + \sqrt {81} .{\left( {\dfrac{{ – 2}}{3}} \right)^2} – 1\\
= \dfrac{1}{4}.\dfrac{4}{5} + 9.\dfrac{4}{9} – 1\\
= \dfrac{1}{5} + 4 – 1\\
= \dfrac{{16}}{5}\\
\dfrac{1}{2}.\sqrt {\dfrac{4}{9}} = \dfrac{1}{2}.\dfrac{2}{3} = \dfrac{1}{3}
\end{array}$