计算:(1)-7+13-6+20;(2)(-49)-(+91)-(-5)+(-9);(3)1+(-2)+|-2-3|-5;(4)(-5)×(

2024-12-26 03:29:46
推荐回答(1个)
回答1:

(1)原式=-7-6+13+20=20;
(2)原式=(-49+5)+(-91-9)=-44-100=-144;
(3)原式=1-2+5-5=-1;
(4)原式=-5×(-7-6)=65;
(5)原式=
2
3
×
5
8
×(-4)=-
5
3

(6)原式=-2×
1
4
+8+
1
2
=-
1
2
+
1
2
+8=8.