问题 解答题
计算:
(1)8+(-
1
4
)-5-(-0.25);
(2)-22×7-(-3)×6+5;
(3)-4.2-(-3
3
7
)+(-5.8)+|-5
4
7
|

(4)70
15
16
÷(-5);
(5)(-
7
9
+
5
6
-
3
4
)÷
1
36
-8÷(-3)2
(6)(-49)×(-0.125)+49×(-
1
8
)-49×(-
4
7
).
答案

(1)原式=8+(-0.25)-5+0.25=(8-5)+(-0.25+0.25)=3;

(2)原式=-4×7+3×6+5=-28+18+5=-5;

(3)原式=[(-4.2)+(-5.8)]+(3

3
7
+5
4
7
)=-10+9=-1;

(4)原式=(70+

15
16
)×(-
1
5
)=-14-
3
16
=-14
3
16

(5)原式=(-

7
9
+
5
6
-
3
4
)×36-8÷9=-
7
9
×36+
5
6
×36-
3
4
×36-
8
9
=-28+30-27-
8
9
=-25
8
9

(6)原式=49×0.125-49×

1
8
+49×
4
7
=49×[0.125-
1
8
+
4
7
]=49×
4
7
=28.

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