x²-4x-5=0 5x²-13x-6=0 (x+1)²-25x²=0
问题描述:
x²-4x-5=0 5x²-13x-6=0 (x+1)²-25x²=0
答
x²-4x-5=01 11 -5(x+1)(x-5)=0x=-1或x=55x²-13x-6=01 -35 2(x-3)(5x+2)=0x=3或x=-2/5(x+1)²-25x²=0(x+1+5x)(x+1-5x)=0(6x+1)(4x-1)=0x=-1/6或x=1/4