问题 解答题
计算(写出计算过程).
(1)(-3.14)+(+4.96)+(+2.14)+(-7.96)
(2)(-2
1
8
)+(+5)+(-3
1
2
)+(+1.125)+(+4
1
2
)

(3)(-3.2)×1.5
(4)1
3
4
×(-8)

(5)(-4)×
1
3
×(-25)×(-6)

(6)24×(
1
8
-
1
6
-
1
4
)

(7)(
1
4
-
1
9
-
1
18
-
1
12
)×(-36)
(8)-99
98
99
×
9
(9)2011×2
1
3
×0×(-389)

(10)-125÷(-25)-64÷(-4)
(11)2×(-3)2-5÷
1
2
×2

(12)(-2)3×8-8×(
1
2
)3+8÷
1
8
答案

(1)(-3.14)+(+4.96)+(+2.14)+(-7.96)

=-3.14+2.14+4.96-7.96

=-1-3

=-4;

(2)(-2

1
8
)+(+5)+(-3
1
2
)+(+1.125)+(+4
1
2
)

=-2.125+1.125-3.5+4.5+5

=-1+1+5

=5;

(3)(-3.2)×1.5

=-4.8;

(4)1

3
4
×(-8)

=-22;

(5)(-4)×

1
3
×(-25)×(-6)

=-4×

1
3
×25×6

=-200;

(6)24×(

1
8
-
1
6
-
1
4
)

=24×

1
8
-24×
1
6
-24×
1
4

=3-4-6

=-7;

(7)(

1
4
-
1
9
-
1
18
-
1
12
)×(-36)

=

1
4
×(-36)-
1
9
×(-36)-
1
18
×(-36)-
1
12
×(-36)

=-9+4+2+3

=0;

(8)-99

98
99
×9

=(-100+

1
99
)×9

=-100×9+

1
99
×9

=-900+

1
11

=-899

10
11

(9)2011×2

1
3
×0×(-389)

=0;

(10)-125÷(-25)-64÷(-4)

=5+16

=21;

(11)2×(-3)2-5÷

1
2
×2

=2×9-5×2×2

=18-20

=-2;

(12)(-2)3×8-8×(

1
2
)3+8÷
1
8

=-8×8-8×

1
8
+8×8

=-64-1+64

=-1.

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