问题 解答题
(1)(-7)+(-3)+|-5|;
(2)3-(-1)+2×(-
1
2
)

(3)(-24)×(
1
12
-
1
6
+
3
8
)

(4)99.9×(-3)(用简便方法计算)
答案

(1)原式=-7-3+5

=-10+5

=-5;

(2)原式=3+1-1

=3;

(3)原式=-24×

1
12
+24×
1
6
-24×
3
8

=-2+4-9

=2-9

=-7;

(4)原式=(100-0.1)×(-3)

=-300+0.3

=-299.7.

单项选择题 A1/A2型题
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