(1)x^2-根号2x-1/4=0 (2) X(X-4)=2-8X (3) X^2+2根号5x+10=0

题目

(1)x^2-根号2x-1/4=0 (2) X(X-4)=2-8X (3) X^2+2根号5x+10=0
用公式法解下列方程

答案

1.x^2-√2 x +1/2 -1/2-1/4=0(x-(√2)/2)^2 -3/4=0(x-(√2)/2)^2=3/4x-(√2)/2=±(√3)/2x1=（√3+√2）/2x2=（-√3+√2）/22.x^2-4x=2-8xx^2+4x+4=2+4(x+2)^2=6x+2=±√6x1=√6-2x2=-√6-23.x^2+2√5x+10=0x^2+2√5...