(120+100X)÷120=X
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(120+100X)÷120=X
(120+100X)÷120=X
(120+100X)÷120=X
6
x/(120-x)=x/60
(120+X)/120=X/100
(120+100X)÷120=X
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)=20% X=?
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
(30+x)÷(120+x)=30%
:① 60%÷120%-3X=20% ② 1÷(X+三分之二)=80% @ X+75%X=15 @75%X-三分之一X=10
x+120/100x=7.7
x+120/100x=7.