计算:
(1)$(-4)×(+7)$; (2)$(-99\frac {3}{5})×0$;
(3)$(-9)×(-\frac {2}{3})$; (4)$(-4.5)×(-\frac {4}{9})$;
(5)$(-2\frac {2}{5})×(+\frac {3}{4})$; (6)$(+5.6)×(-\frac {5}{7})$;
(7)$1\frac {3}{4}×(-8)$; (8)$(-4)×(+1.25)$;
(9)$(-1\frac {2}{3})×(-\frac {1}{5})$; (10)$(-0.7)×(-\frac {15}{4})$.
(1)$(-4)×(+7)$; (2)$(-99\frac {3}{5})×0$;
(3)$(-9)×(-\frac {2}{3})$; (4)$(-4.5)×(-\frac {4}{9})$;
(5)$(-2\frac {2}{5})×(+\frac {3}{4})$; (6)$(+5.6)×(-\frac {5}{7})$;
(7)$1\frac {3}{4}×(-8)$; (8)$(-4)×(+1.25)$;
(9)$(-1\frac {2}{3})×(-\frac {1}{5})$; (10)$(-0.7)×(-\frac {15}{4})$.
答案:
(1)-28
(2)0
(3)6
(4)2
(5)-9/5
(6)-4
(7)-14
(8)-5
(9)1/3
(10)2.625
(1)-28
(2)0
(3)6
(4)2
(5)-9/5
(6)-4
(7)-14
(8)-5
(9)1/3
(10)2.625
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