1. 化简:
(1)$\frac {-27}{9}$; (2)$\frac {-24}{-6}$; (3)$\frac {0}{-8}$; (4)$\frac {-3}{-\frac {6}{5}}$.
(1)$\frac {-27}{9}$; (2)$\frac {-24}{-6}$; (3)$\frac {0}{-8}$; (4)$\frac {-3}{-\frac {6}{5}}$.
答案:1. (1) -3 (2) 4 (3) 0 (4) $\frac{5}{2}$
解析:
(1)$\frac{-27}{9}=-3$;
(2)$\frac{-24}{-6}=4$;
(3)$\frac{0}{-8}=0$;
(4)$\frac{-3}{-\frac{6}{5}}=(-3)×(-\frac{5}{6})=\frac{5}{2}$.
(2)$\frac{-24}{-6}=4$;
(3)$\frac{0}{-8}=0$;
(4)$\frac{-3}{-\frac{6}{5}}=(-3)×(-\frac{5}{6})=\frac{5}{2}$.
2. 计算:
(1)$(-24)÷8$; (2)$(-36)÷(-9)$;
(3)$(+4.5)÷(-0.5)$; (4)$(-6.5)÷(-1.3)$;
(5)$0÷(-\frac {5}{23})$; (6)$(-2.5)÷\frac {5}{4}$;
(7)$-9÷(-\frac {3}{8})$; (8)$\frac {5}{12}÷(-\frac {1}{36})$;
(9)$1÷(-\frac {5}{32})$; (10)$(-15.4)÷(-\frac {11}{5})$.
(1)$(-24)÷8$; (2)$(-36)÷(-9)$;
(3)$(+4.5)÷(-0.5)$; (4)$(-6.5)÷(-1.3)$;
(5)$0÷(-\frac {5}{23})$; (6)$(-2.5)÷\frac {5}{4}$;
(7)$-9÷(-\frac {3}{8})$; (8)$\frac {5}{12}÷(-\frac {1}{36})$;
(9)$1÷(-\frac {5}{32})$; (10)$(-15.4)÷(-\frac {11}{5})$.
答案:2. (1) -3 (2) 4 (3) -9 (4) 5 (5) 0 (6) -2 (7) 24 (8) -15 (9) -$\frac{32}{5}$ (10) 7
解析:
(1) $(-24)÷8=-3$
(2) $(-36)÷(-9)=4$
(3) $(+4.5)÷(-0.5)=-9$
(4) $(-6.5)÷(-1.3)=5$
(5) $0÷(-\frac {5}{23})=0$
(6) $(-2.5)÷\frac {5}{4}=(-2.5)×\frac {4}{5}=-2$
(7) $-9÷(-\frac {3}{8})=-9×(-\frac {8}{3})=24$
(8) $\frac {5}{12}÷(-\frac {1}{36})=\frac {5}{12}×(-36)=-15$
(9) $1÷(-\frac {5}{32})=1×(-\frac {32}{5})=-\frac {32}{5}$
(10) $(-15.4)÷(-\frac {11}{5})=(-15.4)×(-\frac {5}{11})=7$
(2) $(-36)÷(-9)=4$
(3) $(+4.5)÷(-0.5)=-9$
(4) $(-6.5)÷(-1.3)=5$
(5) $0÷(-\frac {5}{23})=0$
(6) $(-2.5)÷\frac {5}{4}=(-2.5)×\frac {4}{5}=-2$
(7) $-9÷(-\frac {3}{8})=-9×(-\frac {8}{3})=24$
(8) $\frac {5}{12}÷(-\frac {1}{36})=\frac {5}{12}×(-36)=-15$
(9) $1÷(-\frac {5}{32})=1×(-\frac {32}{5})=-\frac {32}{5}$
(10) $(-15.4)÷(-\frac {11}{5})=(-15.4)×(-\frac {5}{11})=7$