问题
解答题
计算: (1)(-12)-5+(-14)-(-39) (2)(
(3)(-18)÷2
(4)-63×(-
|
答案
(1)原式=-12-5-14+39=-31+39=8;
(2)原式=
×48-2 3
×48+3 8
×48=32-18+10=24;5 24
(3)原式=-18×
×4 9
×(-4 9
)=1 16
;1 18
(4)原式=-63×
-49=-6-49=-55.1 62