1. 计算:
(1) $-1^{4}-2×(-3)^{2}÷\frac{1}{6}-|-4|$;
(2) $(-1)^{98}-(\frac{2}{3}-\frac{11}{12}+\frac{14}{15})×(-60)$。
(1) $-1^{4}-2×(-3)^{2}÷\frac{1}{6}-|-4|$;
(2) $(-1)^{98}-(\frac{2}{3}-\frac{11}{12}+\frac{14}{15})×(-60)$。
答案
(1)-113 (2)42
2. 计算:
(1) $-3^{2} × \frac{1}{3} - [ (-5)^{2} × (-\frac{3}{5}) - 240 ÷ (-4) × \frac{1}{4} - 2 ]$;
(2) $(-\frac{2}{9})^{2} ÷ (-\frac{1}{3})^{4} × (-1)^{99} - (\frac{11}{8} + \frac{7}{3} - \frac{15}{4}) × (-2)$;
(3) $[50 - (\frac{7}{9} - \frac{11}{12} + \frac{1}{6}) × (-6)^{2}] ÷ (-7)^{2}$;
(4) $\frac{1 - 3 + 5 - 7 + ··· + 101}{-2 + 4 - 6 + 8 - ··· - 202}$。
(1) $-3^{2} × \frac{1}{3} - [ (-5)^{2} × (-\frac{3}{5}) - 240 ÷ (-4) × \frac{1}{4} - 2 ]$;
(2) $(-\frac{2}{9})^{2} ÷ (-\frac{1}{3})^{4} × (-1)^{99} - (\frac{11}{8} + \frac{7}{3} - \frac{15}{4}) × (-2)$;
(3) $[50 - (\frac{7}{9} - \frac{11}{12} + \frac{1}{6}) × (-6)^{2}] ÷ (-7)^{2}$;
(4) $\frac{1 - 3 + 5 - 7 + ··· + 101}{-2 + 4 - 6 + 8 - ··· - 202}$。
答案
(1)-1 (2)$-4\frac{1}{12}$ (3)1
(4)原式=$\frac{\overbrace{(-2)+(-2)+\dots+(-2)}^{25个}+101}{\underbrace{2+2+\dots+2}_{50个}-202}=\frac{-50+101}{100-202}=-\frac{51}{102}=-\frac{1}{2}$
(4)原式=$\frac{\overbrace{(-2)+(-2)+\dots+(-2)}^{25个}+101}{\underbrace{2+2+\dots+2}_{50个}-202}=\frac{-50+101}{100-202}=-\frac{51}{102}=-\frac{1}{2}$
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