(100-X)(80-X)=7644
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(100-X)(80-X)=7644(100-X)(80-X)=7644(100-X)(80-X)=7644(100-X)(80-X)=76448000-180x+x²=7644x²
(100-X)(80-X)=7644
(100-X)(80-X)=7644
(100-X)(80-X)=7644
(100-X)(80-X)=7644
8000-180x+x²=7644
x²-180x+356=0
(x-2)(x-178)=0
x1=2,x2=178
8000-180x+x²=7644
x²-180x+356=0
(x-178)(x-2)=0
∴x=178 x=2
（X+X)+(X-X)+(X*X)+(X/X)=100
(100-X)(80-X)=7644
X/100 + X/80
X+X+X+X+X+X+100X=1690 问：X等于多少
3x*x=1600+x*x-80x
100-X=11分之7x(80+X)=?
X/100+X/80=9/4x
80x=100x(x-4)方程怎么解
（X/80+X/100 +5）*40=X,
80(X+100)=X(60+X)怎么解
x+80=100+x 求X是多少?
2X/(X/80+X/100）=
100x=80*(72-x)
80*X=100*(X-60)
(80-x)(100-x)=1200诶解是
80（X+2）=100X
100X=80(X+2)
80x+20=100-2x