x÷40%x=11.2这道题怎末算,
x/40+x/60+[20-(x/40+x/60)*8]÷40=x/40+(20-x)/8怎么解
(X+X)+(X-X)+(X*X)+(X/X)=100
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%
5x÷8-3x=40 7x-8=42+3x 9x+7-3x=9x-3
2x^2-4x/x+2`x^2+2x/x^2-4x+4÷x/3x-6,其中x=根号3/2
1. x+0.5x=6 4x+16=40 x/5=32% x-4/9x=10/21 x-1/8x=5/8 7x÷2=2.
X=几?5X-4=40 5(X-4)=40 (48-3X)÷3=0 X+5X-7
[x(x-y)-y(x-y)+(x+y)(x-y)]÷2x其中x=2012 y=2013
x+x=x+15