问题
解答题
计算: (1)
(2)28×
(3)(-1)+(1-
|
答案
(1)原式=2.5-21+8.5=-10;
(2)原式=28×(
3 |
4 |
1 |
4 |
(3)原式=-1+0.5÷3×(2-8)
=-1+0.5÷3×(-6)
=-1-1
=-2
计算: (1)
(2)28×
(3)(-1)+(1-
|
(1)原式=2.5-21+8.5=-10;
(2)原式=28×(
3 |
4 |
1 |
4 |
(3)原式=-1+0.5÷3×(2-8)
=-1+0.5÷3×(-6)
=-1-1
=-2