问题 解答题
计算:
(1)-165+265-78-22+65;
(2)(-
1
2
)-(-2
1
3
)+2
3
4
+(-
7
8
)-3
2
3

(3)-42-12×(
1
3
-1)÷(-1
1
3
);
(4)3-(-2)×(-1)-8÷(-
1
2
2×|-3+1|.
答案

(1)原式=-100+265-100

=-200+265

=65;

(2)原式=-

1
2
+2
1
3
+2
3
4
-
7
8
-3
2
3

=-

1
2
-1
1
3
+2
3
4
-
7
8

=1-

20
24
-
3
24

=

1
24

(3)原式=-16-12×(-

2
3
)÷(-1
1
3

=-16+8÷(-1

1
3

=-16-6

=-22;

(4)原式=3-2-8÷

1
4
×2

=1-64

=-63.

单项选择题
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