40000=(X-60)(-100X+10000),怎么解这个方程
问题描述:
40000=(X-60)(-100X+10000),怎么解这个方程
答
40000=(X-60)(-100X+10000)
40000=-100X^2+10000X+6000X-600000
X^2-160X+6400=0
(X-80)^2=0
X-80=0
X=80