1.5x+27=0.5x+40
(x-22)+(x-24)+(x-27)+(x-20)=x
0.1X+0.5(27-X)=5.1
(X+X)+(X-X)+(X*X)+(X/X)=100
4X+0.5X=13.5X
56-x =x- (40-x)
15.6-2(x-13)=23+x和1.5(x-9)=0.5x+3.5
x-(0.5x+18)-(0.5x-5)=40 求x等于多少?
y=(x+3)(x+3-0.5x^2-x+1.5)*1/2 最大值
(3x-1)/0.5=(4-x)/0.3+(3x+5)/1.5 x得多少?
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%