计算:(1)(-1.25)+114(2)(-6)-(+6)(3)-22×(-3)2(4)18-(+12)+(-21)+(+12)(5)(-23)÷(-3)×13(6)(12+56-712)×(-36)(7)(-245×156-0.25×5-25)×(-1)5.(8)(-3)×(-3617)+(+9)×(+3617-数学

题文

计算:
(1)(-1.25)+1
1
4

(2)(-6)-(+6)
(3)-22×(-3)2                   
(4)18-(+12)+(-21)+(+12)
(5)(-23)÷(-3)×
1
3

(6)(
1
2
+
5
6
-
7
12
)×(-36)
(7)(-2
4
5
×1
5
6
-0.25×5-
2
5
)×(-1)5
(8)(-3)×(-3
6
17
)+(+9)×(+3
6
17
)-(-12)×(-3
6
17
).
题型:解答题  难度:中档

答案

(1)原式=-1.25+1.25
=0;

(2)原式=-6-6
=-12;

(3)原式=-4×9
=-36;

(4)原式=18-12-21+12
=-3;

(5)原式=
23
3
×
1
3

=
23
9


(6)原式=
1
2
×(-36)+
5
6
×(-36)-
7
12
×(-36)
=-18-30+21
=-27;

(7)原式=(-
14
5
×
11
6
-
1
4
×4-
2
5
)×(-1)
=(-
77
15
-1-
2
5
)×(-1)
=
98
15


(8)原式=3
6
17
×(3+9-12)
=0.

据专家权威分析,试题“计算:(1)(-1.25)+114(2)(-6)-(+6)(3)-22×(-3)2(4)18-(+12)+(-21..”主要考查你对  有理数的混合运算  等考点的理解。关于这些考点的“档案”如下:

有理数的混合运算