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1. 计算:
(1) $-18÷(-3)^2 + 5×(-3)^3 - (-15)÷5$；
(2) $(-20)×(-\frac{9}{22}) + 4×(-3)×(-\frac{9}{22}) + 5÷\frac{1}{2}×(-\frac{9}{22})$。
(1) $-18÷(-3)^2 + 5×(-3)^3 - (-15)÷5$；
(2) $(-20)×(-\frac{9}{22}) + 4×(-3)×(-\frac{9}{22}) + 5÷\frac{1}{2}×(-\frac{9}{22})$。
答案
(1)-134
(2)9
(2)9
2. 计算：
(1) $-(\dfrac{2}{3})^2 × 9 - 2 × (-\dfrac{1}{3}) ÷ \dfrac{2}{3} + 4 × (-0.5)^2$；
(2) $[ (-1)^{108} + (1 - \dfrac{1}{2}) × \dfrac{1}{3} ] ÷ (-3^2 + 2)$；
(3) $[ -2^3 + (-2)^3 ] × ( \dfrac{5}{6} ÷ \dfrac{4}{9} ) × (-2)^4$；
(4) $( -1\dfrac{1}{5} + \dfrac{7}{10} - \dfrac{3}{4} ) × 20 - 5.9 × \dfrac{3}{8} + (-5.9) × \dfrac{5}{8}$。
(1) $-(\dfrac{2}{3})^2 × 9 - 2 × (-\dfrac{1}{3}) ÷ \dfrac{2}{3} + 4 × (-0.5)^2$；
(2) $[ (-1)^{108} + (1 - \dfrac{1}{2}) × \dfrac{1}{3} ] ÷ (-3^2 + 2)$；
(3) $[ -2^3 + (-2)^3 ] × ( \dfrac{5}{6} ÷ \dfrac{4}{9} ) × (-2)^4$；
(4) $( -1\dfrac{1}{5} + \dfrac{7}{10} - \dfrac{3}{4} ) × 20 - 5.9 × \dfrac{3}{8} + (-5.9) × \dfrac{5}{8}$。
答案
(1)-2
(2)$-\dfrac{1}{6}$
(3)-480
(4)-30.9
(2)$-\dfrac{1}{6}$
(3)-480
(4)-30.9
