问题 解答题
计算:
(1)(-12)÷4×(-6)÷2;
(2)(-
5
8
)×(-4)2-0.25×(-5)×(-4)3

(3)(-1
1
2
)-1
1
4
+(-2
1
2
)-(-3
3
4
)-(-1
1
4
)

(4)(-3)2÷2
1
4
×(-
2
3
)2+4-22×(-
1
3
)

(5)|
4
5
+
2
3
×(-12)÷6-(-3)2|+|24+(-3)2|×(-5)

(6)1+3+5+…+99-(2+4+6+…+98).
答案

(1)原式=(-12)×

1
4
×(-6)×
1
2

=(-3)×(-6)×

1
2

=18×

1
2

=9;

(2)原式=(-

5
8
)×16-
1
4
×(-5)×(-4)2×(-4)

=-10-80

=-90;

(3)原式=-

3
2
-
5
4
-
5
2
+
15
4
+
5
4

=(-

3
2
-
5
2
)-(
5
4
-
15
4
-
5
4

=-4+

15
4

=-

1
4

(4)原式=9×

4
9
×
4
9
+4-4×(-
1
3

=

16
9
+4+
4
3

=

16+12
9
+4

=

64
9

(5)原式=|

4
5
+
2
3
×(-12)×
1
6
-9|+|24+9|×(-5)

=|

4
5
-
4
3
-9|+|33|×(-5)

=|-9

8
15
|-165

=-155

7
15

(6)原式=1+(3-2)+(5-4)+…+(99-98)

=1+1+1+…+1

=50.

综合
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