解方程(1)(2x-1)^2=13 (2)2x^2-8x=-5 (3)x^2+3x-4=0 (4)(x+5)^2=5(x+50
问题描述:
解方程(1)(2x-1)^2=13 (2)2x^2-8x=-5 (3)x^2+3x-4=0 (4)(x+5)^2=5(x+50
答
(1)(2x-1)^2=13 2x-1=±√132x=1±√13x=(1±√13)/2(2)2x^2-8x=-5 x²-4x=-5/2(x-2)²=3/2x-2=±√6/2x=2±√6/2(3)x^2+3x-4=0 (x+4)(x-1)=0x=-4或x=1(4)(x+5)^2=5(x+5)(x+5)(x+5-5)=0x(x+5)=...