问题 解答题
计算下列各式:
(1)2+(-8)-(-3);
(2)2-2÷
1
3
×3

(3)25×
3
4
-(-25)×
1
2
+25×(-
1
4
)

(4)-22×|-
1
2
|+8÷(-2)2
答案

(1)2+(-8)-(-3),

=2-8+3,

=5-8,

=-3;

(2)2-2÷

1
3
×3,

=2-2×3×3,

=2-18,

=-16;

(3)25×

3
4
-(-25)×
1
2
+25×(-
1
4
),

=25×

3
4
+25×
1
2
-25×
1
4

=25×(

3
4
+
1
2
-
1
4
),

=25×1,

=25;

(4)-22×|-

1
2
|+8÷(-2)2

=-4×

1
2
+8÷4,

=-2+2,

=0.

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