1. 计算:
(1)$-3^{2}÷3-\frac {2}{3}×12$; (2)$4×(-\frac {3}{2})^{2}-5÷\frac {1}{2}×(-2)$;
(3)$[2-5×(-\frac {1}{2})^{2}]÷(-\frac {1}{4})$; (4)$-1^{4}-(1-0×4)÷\frac {1}{3}×[(-2)^{2}-6]$。
(1)$-3^{2}÷3-\frac {2}{3}×12$; (2)$4×(-\frac {3}{2})^{2}-5÷\frac {1}{2}×(-2)$;
(3)$[2-5×(-\frac {1}{2})^{2}]÷(-\frac {1}{4})$; (4)$-1^{4}-(1-0×4)÷\frac {1}{3}×[(-2)^{2}-6]$。
答案:
1.
(1)-11
(2)29
(3)-3
(4)5
(1)-11
(2)29
(3)-3
(4)5
2. 用合适的方法计算下列各题:
(1)$-0.5+3\frac {1}{4}+2.6-5\frac {1}{2}+1.75$; (2)$(-81)÷(-\frac {9}{4})×\frac {4}{9}÷(-16)$;
(3)$(-24)×(-\frac {1}{2}-\frac {3}{4}+\frac {5}{6})$; (4)$-7×(-\frac {3}{7})+10×(-\frac {3}{7})+(-2)×\frac {3}{7}$;
(5)$48\frac {24}{25}÷(-48)$; (6)$-15.45×2\frac {5}{13}+4.05×(-2\frac {5}{13})-6.5×(-2\frac {5}{13})$。
(1)$-0.5+3\frac {1}{4}+2.6-5\frac {1}{2}+1.75$; (2)$(-81)÷(-\frac {9}{4})×\frac {4}{9}÷(-16)$;
(3)$(-24)×(-\frac {1}{2}-\frac {3}{4}+\frac {5}{6})$; (4)$-7×(-\frac {3}{7})+10×(-\frac {3}{7})+(-2)×\frac {3}{7}$;
(5)$48\frac {24}{25}÷(-48)$; (6)$-15.45×2\frac {5}{13}+4.05×(-2\frac {5}{13})-6.5×(-2\frac {5}{13})$。
答案:
2.
(1)1.6
(2)-1
(3)10
(4)$-\frac{15}{7}$
(5)$-\frac{51}{50}$
(6)-31
(1)1.6
(2)-1
(3)10
(4)$-\frac{15}{7}$
(5)$-\frac{51}{50}$
(6)-31
查看更多完整答案,请扫码查看