(1)2×(-5)+23-3÷12; (2)112×[3×(?23)2-1]-13×(-2)3;(3)x-x...
(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(2...
(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).
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2014-10-29
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(1)原式=-10+8-4
=-6;
(2)原式=
×[3×
-1]-
×(-8)
=
×[
-1]+
=
×
+
=
+
=
;
(3)x-
=2-
解: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)
[x-
(x-1)]=
(2x+1)
解:x-
(x-1)=3x+
6x-2x+2=18x+9
6x-2x-18x=9-2
-14x=7
x=-
.
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