(1)-2x^2+13-15=0 (2)x^2=2√2x-2 (3)(2/3)x^2-(1/6)x=1/2
问题描述:
(1)-2x^2+13-15=0 (2)x^2=2√2x-2 (3)(2/3)x^2-(1/6)x=1/2
答
(1)-2x^2+13-15=0 2x²-13x+15=0(2x-3)(x-5)=0x1=3/2x2-5 (2)x^2=2√2x-2 x^2-2√2x+2=0(x-√2)^2=0x=√2 (3)(2/3)x^2-(1/6)x=1/24x^2-x=34x^2-x-3=0(4x+3)(x-1)=0x1=-3/4x2=1