4(x-3)(x-1)-(2x-30)^2-6=0
问题描述:
4(x-3)(x-1)-(2x-30)^2-6=0
答
4(x^2-x-3x+3)-(4x^2-120x+900)-6=0
4x^2-16x+12-4x^2+120x-900-6=0
104x=900+6-12
x=447/52