题目内容

(1)-7+(+2)
(2)0-(-5)
(3)(-49)-(+91)-(-5)+(-9)
(4)-7+13-6+20
(5)(-1
1
2
)-1
1
4
+(-2
1
2
)-(-3
3
4
)-(-1
1
4

(6)(-5)×(-4
1
5

(7)
3
7
÷(-2
1
7

(8)(-5)×(-7)×2×(-6)
(9)(-
7
8
)×15×(-1
1
7

(10)19
15
17
×(-10)
(11)(-0.125)×0.5×(-100)×8
(12)3×(-2
1
3
)+2×(-2
1
3
)-5×(-
7
3

(13)-22×(-
1
2
)+8÷(-2)2
(1)-7+(+2)=-5;

(2)0-(-5)=5;

(3)(-49)-(+91)-(-5)+(-9)
=-49-91+5-9
=-149+5
=-144;

(4)-7+13-6+20
=-13+33
=20;

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

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

=-4+3
3
4

=-
1
4


(6)(-5)×(-4
1
5
)=21;

(7)
3
7
÷(-2
1
7
)=-
1
5


(8)(-5)×(-7)×2×(-6)
=(-5×2)×[(-7)×(-6)]
=-10×42
=-420;

(9)(-
7
8
)×15×(-1
1
7

=[(-
7
8
)×(-1
1
7
)]×15
=1×15
=15;

(10)19
15
17
×(-10)
=(20-
2
17
)×(-10)
=-200+1
3
17

=-188
14
17


(11)(-0.125)×0.5×(-100)×8
=(-0.125×8)×[0.5×(-100)]
=-1×(-50)
=50

(12)3×(-2
1
3
)+2×(-2
1
3
)-5×(-
7
3

=(3+2-5)×(-
7
3

=0×(-
7
3

=0;

(13)-22×(-
1
2
)+8÷(-2)2
=-4×(-
1
2
)+8÷4
=2+2
=4.
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