7.计算题
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$\frac{x}{0.3}$=$\frac{7.5}{0.25}$ | $\frac{14}{15}$+($\frac{3}{4}$-$\frac{2}{3}$)÷$\frac{1}{5}$ | 1080×(15.7-30.9÷3) |
(2$\frac{1}{6}$-0.5)÷[(1.2+1.55)×$\frac{20}{33}$] | [3.86-(0.2+$\frac{1}{3}$×4$\frac{1}{2}$)]÷13.5 | (2512+5066÷17)×554 |