计算:(1)?2×(?12)2+|?2|3?(?12);(2)?14?(0.5?23)×[?2?(?3)3];(3)4x-3(20-x)=5x-7(20-x);

计算:(1)?2×(?12)2+|?2|3?(?12);(2)?14?(0.5?23)×[?2?(?3)3];(3)4x-3(20-x)=5x-7(20-x); (4)1-2x?56=3?x4.

(1)原式=-2×
1
4
+8+
1
2

=-
1
2
+8+
1
2

=8;
(2)原式=-1-(-
1
6
)×(-2+27)
=-1-(-
1
6
)×25
=-1+
25
6

=
19
6

(3)4x-3(20-x)=5x-7(20-x)
4x-60+3x=5x-140+7x
4x+3x-5x-7x=-140+60
-5x=-80
x=16;
(4)1-
2x?5
6
=
3?x
4

12-2(2x-5)=3(3-x)
12-4x+10=9-3x
-4x+3x=9-10-12
-x=-13
x=13.
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