计算下列各题(1)(5-6)-(7-9);            (2)(-414)-(+513)-(-414)(3)22+(-4)+(-2)+4;      

计算下列各题(1)(5-6)-(7-9);            (2)(-414)-(+513)-(-414)(3)22+(-4)+(-2)+4;      

题型:解答题难度:一般来源:不详
计算下列各题
(1)(5-6)-(7-9);            (2)(-4
1
4
)-(+5
1
3
)-(-4
1
4
)

(3)22+(-4)+(-2)+4;         (4)(-8)+(+0.25)-(-9)+(-
1
4

(5)(-81)÷2
1
4
;               (6)(-3)×
5
6
×(-
4
5
)×(-
1
4
)

(7)(1-
1
6
+
3
4
)×(-48);        (8)-1
1
2
÷
3
4
×(-0.2)×(-
5
2
答案
(1)(5-6)-(7-9)
=[5+(-6)]-[7+(-9)]
=-1-(-2)
=-1+2
=1;

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

=(-4
1
4
)-5
1
3
+4
1
4

=(-4
1
4
)+4
1
4
-5
1
3

=-5
1
3


(3)22+(-4)+(-2)+4
=(22+4)+[(-4)+(-2)]
=26+(-6)
=20;

(4)(-8)+(+0.25)-(-9)+(-
1
4

=(-8)+(+0.25)+9+(-0.25)
=(-8)+9+[(+0.25)+(-0.25)]
=1+0
=1;

(5)(-81)÷2
1
4

=(-81)÷
9
4

=(-81)×
4
9

=-36;

(6)(-3)×
5
6
×(-
4
5
)×(-
1
4
)

=-3×
5
6
×
4
5
×
1
4

=-
1
2


(7)(1-
1
6
+
3
4
)×(-48)
=1×(-48)-
1
6
×(-48)+
3
4
×(-48)
=-48+8-36
=-84+8
=-(84-8)
=-76;

(8)-1
1
2
÷
3
4
×(-0.2)×(-
5
2

=-
3
2
×
4
3
×(-
1
5
)×(-
5
2

=-
3
2
×
4
3
×
1
5
×
5
2

=-1.
举一反三
计算
①23+(-37)-23+7               
②(
2
3
-
1
4
-
3
8
)×(-24)
③-22-(-3)2×(-1)3
④4×(-8)×25×(-1.25)
⑤4-[(-5-3)÷23]+32÷(-2)3
题型:解答题难度:一般| 查看答案
小明做了以下4道计算题:①(-1)2008=2008;②0-(-1)=1;③-
1
2
+
1
3
=-
1
6
;④
1
2
÷(-
1
2
)=-1
.请你帮他检查一下,他一共做对了(  )
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4
9
×(-9)
题型:解答题难度:一般| 查看答案
计算:(-1)-(-5
1
2
)×
4
11
-23÷[(-3)+5].
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计算:
(1)-9+5×(-6)-(-4)2÷(-8);
(2)(-3)2-(1
1
2
)3×
2
9
-6÷|-
2
3
|
题型:解答题难度:一般| 查看答案
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