(40-40x)x+40x=40-32.4
56-x =x- (40-x)
X/(x-30)=(x+40)/X解方程,
(X+X*20%)-[(1200-X)-(1200-X)*20%]=40%
X+X*20%-(1200-X)-(1200-X)*20%=40%
(X/80+X/100 +5)*40=X,
2x+(22-x)=40
(x+40)*80%-x=12
2*【x+(x+40)】=400
解方程(1/3)*X+40%*X+52=x+1/6x
1/4x+5+1/2【x-(1/4x+5)】-5+40=x
解方程 X+40%X=28 X-20%X=10.4 X+34
x除55%=100 60%x=30 x+50%x=4.5 (1-25%)x=72 4x+40%x=176 解方程