(1/5+5/6-9/10).3/5-0,75:1 1/2(hỗn số)-1,25 mũ 2
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Đáp án:
Giải thích các bước giải: \(\begin{array}{l}\left( {\frac{1}{5} + \frac{5}{6} - \frac{9}{{10}}} \right).\frac{3}{5} - 0,75:1\frac{1}{2} - {\left( {1,25} \right)^2}\\ = \left( {\frac{1}{5} + \frac{5}{6} - \frac{9}{{10}}} \right).\frac{3}{5} - \frac{3}{4}:\frac{3}{2} - {\left( {\frac{5}{4}} \right)^2}\\ = \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\frac{2}{{15}}.\frac{3}{5}\,\,\,\,\,\, - \frac{1}{2}\,\,\,\,\,\,\,\, - \,\frac{{25}}{{16}}\\ = \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\frac{2}{{25}} - \frac{1}{2} - \frac{{25}}{{16}}\\ = \,\,\,\,\,\,\,\,\frac{{ - 793}}{{400}}\end{array}\)
