(1)2×(-5)+23-3÷12;(2)112×[3×(-23)2-1]-13×(-2)3;(3)x-x-12=2-x+23;(4)12[x-13(x-1)]=34(2x+1).-数学

题目简介

(1)2×(-5)+23-3÷12;(2)112×[3×(-23)2-1]-13×(-2)3;(3)x-x-12=2-x+23;(4)12[x-13(x-1)]=34(2x+1).-数学

题目详情

(1)2×(-5)+23-3÷12;
(2)1
1
2
×[3×(-
2
3
)2
-1]-
1
3
×(-2)3
(3)x-
x-1
2
=2-
x+2
3

(4)
1
2
[x-
1
3
(x-1)]=
3
4
(2x+1).
题型:解答题难度:中档来源:不详

答案

(1)原式=-10+8-4
=-6;

(2)原式=class="stub"3
2
×[3×class="stub"4
9
-1]-class="stub"1
3
×(-8)
=class="stub"3
2
×[class="stub"4
3
-1]+class="stub"8
3

=class="stub"3
2
×class="stub"1
3
+class="stub"8
3

=class="stub"1
2
+class="stub"8
3

=class="stub"19
6


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

6x-3(x-1)=12-2(x+2)
6x-3x+3=12-2x-4
6x-3x+2x=12-4-3
5x=5
x=1;

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

6x-2x+2=18x+9
6x-2x-18x=9-2
-14x=7
x=-class="stub"1
2

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