(120+X)/120=X/100
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(120+X)/120=X/100(120+X)/120=X/100(120+X)/120=X/100(120+X)/120=X/100同乘以600得5(120+x)=6x600+5x=6xx=600
(120+X)/120=X/100
(120+X)/120=X/100
(120+X)/120=X/100
(120+X)/120=X/100
同乘以600得
5(120+x)=6x
600+5x=6x
x=600
x/(120-x)=x/60
(120+X)/120=X/100
X[X/(Y+X)+X/(X-Y)]=120/288 求X/Y
(X+X)+(X-X)+(X*X)+(X/X)=100
(x-120)/120=(120+x-100)/(x-120+100)
x(120+x)*80%=x-76
x(x+1)(x-1)=120
x-x/4-120=x/2
0.5X+120+0.3X=X
x/(120-x)=(60-x)/60
25%X+三分之一X+120=X
536-120%x-x=x-80
x+120/100x=7.7
x+120/100x=7.
(0.2-x)(500-100x)=120
(120-x)/(100+x)=3/8 ...
(1.5x+x)×2=120
3x-(4800+x)=120