题目内容

(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).
(1)原式=-10+8-4
=-6;

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

=
3
2
×
1
3
+
8
3

=
1
2
+
8
3

=
19
6


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

6x-2x+2=18x+9
6x-2x-18x=9-2
-14x=7
x=-
1
2
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