A 部分
(1)7(2x-1)-3(4x-1)=4(3x+2)-1; (2) (5y+1)+ (1-y)= (9y+1)+ (1-3y);
3) [ (1/4x-3)-4 ]=x+2; (4)20%+(1-20%)(320-x)=320 × 40%
(5)2(x-2)+2=x+1 (6)2(x-2)-3(4x-1)=9(1-x)
(7)11x+64-2x=100-9x (8)15-(8-5x)=7x+(4-3x)
(9)3(x-7)-2[9-4(2-x)]=22 (10 )3/2[2/3(1/4x-1)-2]-x=2
(11) 2x-=15 (12) -(1-)x=80
1
(13) x/2+3x/2=7 (14 ) 3x+7=32-2x (15) 3x+5(138-x)=540
(16) 3x-7(x-1)=3-2(x+3) (17) 18x+3x-3=18-2(2x-1)
(18) 3(20-y)=6y-4(y-11) (19) -(x/4-1)=5
3 1
(20) 3[4(5y-1)-8]=6 (21) x x
2 3
4 4
;
(22)(x+1)-3(x-1)=1 - 3x; (23) (x-2)-2(4x -1)=3(1 -x).
3x 1 4x
2 5
2
1
x 4 x
(x 5)
(25) 5 2
2
(24)
;
x 3 x 3
3 6
x 4
x 4 x
;( 27 )
(26)
;
2
(28)
4
5
5
[ (x 4) 5x 10]
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