解下列方程:(1)x²-15x=100 (2)(2x²-1)²-1=0 (3)(x-1)²-18=0(4)3(x-5)²=2(5-x)用因式分解法解下列一元二次方程(1)9t²-(t-1)²=0

问题描述:

解下列方程:(1)x²-15x=100 (2)(2x²-1)²-1=0 (3)(x-1)²-18=0
(4)3(x-5)²=2(5-x)
用因式分解法解下列一元二次方程
(1)9t²-(t-1)²=0

(1)x²-15x=100 x²-15x-100 =0(x-20)(x+5)=0x1=20 x2=-5(2)(2x²-1)²-1=0 (2x²-1)²=12x²-1=±12x²=0或2x²=2x²=0或x²=1x1=0 x2=1 x3=-1(3)(x-1)...