(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
题文
(1)2×(-5)+23-3÷12; (2)1
(3)x-
(4)
|
答案
(1)原式=-10+8-4 =-6; (2)原式=
=
=
=
=
(3)x-
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-
6x-2x+2=18x+9 6x-2x-18x=9-2 -14x=7 x=-
|