问题
解答题
计算: (1)(-14)+(+19)+(-6)+(+31)+(-19) (2)23×(-5)-(-3)÷
(3)-23+[(-4)2-(1-32)×3] (4)[1
|
答案
(1)原式=-20+31
=11;
(2)原式=-115+128
=13;
(3)原式=-8+16-(-8)×3
=-8+16+24
=32;
(4)原式=(1
-9-4+18)×(-1 24
)1 5
=
×(-25 24
)+5×(-1 5
)1 5
=-
-15 24
=-1
.5 24