x(30-x)=200
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x(30-x)=200
(x+30)*(x-18)=x*x
30%x+70%(200-x)=200+54%x
30x-x²=200 求X
x²-30x+200=0
(1+30%)X×80%=200+X
(X+X)+(X-X)+(X*X)+(X/X)=100
(X+X-200)/(X-200)=5
30/x=30/(x-1.5)-x
50X=200+X*X
260x=200X(x+6)
0.8x=x-30 x=
x ( x-30)= -67.5 X=?
x-30-0.2x=0.5x
3X+30+X+X-15=?
x+35=(x+3x)*30%
60x(x-4)=30x
80%x+30-x=10%x