数学
计算:
(1)10-(-3)
(2)-
7
5
+(+
1
10
)
(3)[(-5)-(+7)]+|-9|
(4)
5.7-4.2-8.4-2.3+1
1
5
(5)
2
9
-(-1
5
6
)+(-1
2
9
)-
1
3
(6)
-0.5+(-15
1
3
)-(-17.5)-|-12
2
3
|
.
计算:
(-2.7)+(+1
3
5
)+(-6.7)+(-1.6)
.
(-8)-(-15)+(-9)-(-12)
计算:
(1)(-2.8)-(+1.2);
(2)(-6)+(+5);
(3)-(-2)-|-3|;
(4)(-
1
4
)-(-0.25);
(5)(-0.6)+1.7+(+0.6 )+(-1.7 )+(-9 );
(6)
|-2
1
2
|-(-2.5)+1-|1-2
1
2
|
;
(7)
3
1
2
-(-2
1
4
)+(-
1
3
)-
1
4
-(+
1
6
)
.
计算
(1)0.47-4-(-1.53)-1;
(2)(0.75)+(-2.8)+(-0.2)-1.25.
计算(-20)+(+3)-(+5)-(-7)
(-32
1
2
)-[5
1
4
-(+3
1
7
)+(-5
1
4
)+(-2
6
7
)].
5.7-4.2-8.4-2.3+1
1
5
.
(-1.5)+
1
2
-(-
3
5
)-0.2.
(-0.125)+22
3
5
-|-5
7
8
|-25.6
.
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