(1)-7+(+2)(2)0-(-5)(3)(-49)-(+91)-(-5)+(-9)(4)-7+13-6+20(5)(-112)-114+(-212)-(-334)-(-114)(6)(-5)×(-

题目简介

(1)-7+(+2)(2)0-(-5)(3)(-49)-(+91)-(-5)+(-9)(4)-7+13-6+20(5)(-112)-114+(-212)-(-334)-(-114)(6)(-5)×(-

题目详情

(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
题型:解答题难度:中档来源:不详

答案

(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)(-1class="stub"1
2
)-1class="stub"1
4
+(-2class="stub"1
2
)-(-3class="stub"3
4
)-(-1class="stub"1
4

=(-1class="stub"1
2
-2class="stub"1
2
)+(-1class="stub"1
4
+1class="stub"1
4
+3class="stub"3
4

=-4+3class="stub"3
4

=-class="stub"1
4


(6)(-5)×(-4class="stub"1
5
)=21;

(7)class="stub"3
7
÷(-2class="stub"1
7
)=-class="stub"1
5


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

(9)(-class="stub"7
8
)×15×(-1class="stub"1
7

=[(-class="stub"7
8
)×(-1class="stub"1
7
)]×15
=1×15
=15;

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

=-188class="stub"14
17


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

(12)3×(-2class="stub"1
3
)+2×(-2class="stub"1
3
)-5×(-class="stub"7
3

=(3+2-5)×(-class="stub"7
3

=0×(-class="stub"7
3

=0;

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

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