题目内容
(1)-7+(+2)
(2)0-(-5)
(3)(-49)-(+91)-(-5)+(-9)
(4)-7+13-6+20
(5)(-1
)-1
+(-2
)-(-3
)-(-1
)
(6)(-5)×(-4
)
(7)
÷(-2
)
(8)(-5)×(-7)×2×(-6)
(9)(-
)×15×(-1
)
(10)19
×(-10)
(11)(-0.125)×0.5×(-100)×8
(12)3×(-2
)+2×(-2
)-5×(-
)
(13)-22×(-
)+8÷(-2)2.
(2)0-(-5)
(3)(-49)-(+91)-(-5)+(-9)
(4)-7+13-6+20
(5)(-1
1 |
2 |
1 |
4 |
1 |
2 |
3 |
4 |
1 |
4 |
(6)(-5)×(-4
1 |
5 |
(7)
3 |
7 |
1 |
7 |
(8)(-5)×(-7)×2×(-6)
(9)(-
7 |
8 |
1 |
7 |
(10)19
15 |
17 |
(11)(-0.125)×0.5×(-100)×8
(12)3×(-2
1 |
3 |
1 |
3 |
7 |
3 |
(13)-22×(-
1 |
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
)-(-3
)-(-1
)
=(-1
-2
)+(-1
+1
+3
)
=-4+3
=-
;
(6)(-5)×(-4
)=21;
(7)
÷(-2
)=-
;
(8)(-5)×(-7)×2×(-6)
=(-5×2)×[(-7)×(-6)]
=-10×42
=-420;
(9)(-
)×15×(-1
)
=[(-
)×(-1
)]×15
=1×15
=15;
(10)19
×(-10)
=(20-
)×(-10)
=-200+1
=-188
;
(11)(-0.125)×0.5×(-100)×8
=(-0.125×8)×[0.5×(-100)]
=-1×(-50)
=50
(12)3×(-2
)+2×(-2
)-5×(-
)
=(3+2-5)×(-
)
=0×(-
)
=0;
(13)-22×(-
)+8÷(-2)2.
=-4×(-
)+8÷4
=2+2
=4.
(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 |
4 |
1 |
2 |
3 |
4 |
1 |
4 |
=(-1
1 |
2 |
1 |
2 |
1 |
4 |
1 |
4 |
3 |
4 |
=-4+3
3 |
4 |
=-
1 |
4 |
(6)(-5)×(-4
1 |
5 |
(7)
3 |
7 |
1 |
7 |
1 |
5 |
(8)(-5)×(-7)×2×(-6)
=(-5×2)×[(-7)×(-6)]
=-10×42
=-420;
(9)(-
7 |
8 |
1 |
7 |
=[(-
7 |
8 |
1 |
7 |
=1×15
=15;
(10)19
15 |
17 |
=(20-
2 |
17 |
=-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 |
1 |
3 |
7 |
3 |
=(3+2-5)×(-
7 |
3 |
=0×(-
7 |
3 |
=0;
(13)-22×(-
1 |
2 |
=-4×(-
1 |
2 |
=2+2
=4.
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