计算:(1)(+1.75)+(-13)+(+45)+(+1.05)+(-23)+(+2.2)(2)(12-23+0.4)×(-30)(3)(-0.1)÷12×(-100)(4)(-2)3-32(5)36×(12-13)2(6)16÷(-2)3-(-18)×(-4)(7)101-102+103-104+…+1-数学

题文

计算:
(1)(+1.75)+(-
1
3
)+(+
4
5
)+(+1.05)+(-
2
3
)+(+2.2)
(2)(
1
2
-
2
3
+0.4)×(-30)
(3)(-0.1)÷
1
2
×(-100)
(4) (-2)3-32
(5)36×(
1
2
-
1
3
)2
(6)16÷(-2)3-(-
1
8
)×(-4)
(7) 101-102+103-104+…+199-200
题型:解答题  难度:中档

答案

(1)原式=1.75-
1
3
+
4
5
+1.05-
2
3
+2.2
=(1.75+0.8+1.05+2.2)-(
1
3
+
2
3

=5.8-1
=4.8;
(2)原式=
1
2
×(-30)-
2
3
×(-30)+0.4×(-30)
=-15+20-12
=-7;
(3)原式=(-
1
10
)×2×(-100)
=(-
1
5
)×(-100)
=20;
(4)原式=-8-9
=-17;
(5)原式=36×(
3
6
-
2
6
)2
=36×
1
36

=1;
(6)原式=16÷(-8)-
1
2

=-2-
1
2

=-
5
2

(7)原式=(-1)+(-1)+…+(-1)
=(-1)×50
=-50.

据专家权威分析,试题“计算:(1)(+1.75)+(-13)+(+45)+(+1.05)+(-23)+(+2.2)(2)(12-23..”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

考点名称:有理数的混合运算

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