x-0.3x-0.5x=20
x-0.5x=20+0.3x解方程
(X+X)+(X-X)+(X*X)+(X/X)=100
(x-22)+(x-24)+(x-27)+(x-20)=x
(x+2005)/ (x+2004)+(x+2007)/(x+2006)=(x+2008)/(x+2007)+(x+20
0.5分之x=0.3分之x-18 x=?
0.5x+(5x+20)*0.5=298 x
0.3X+0.6*(20-X)=9,求X
4X+0.5X=13.5X
0.88(X+20%X)=X+84
0.5(x+x-20)=84
20%x+12=0.5x
5*(x-2)=4*(x+3) 2x+(50-x)*4=140 3x-(8-x)=20*4 200x=(x-0.5)*2