用*法解方程2x2-4x-1=0①方程两边同时除以2得
问题详情:
用*法解方程2x2-4x-1=0
①方程两边同时除以2得_________________________
②移项得_____________________________________
③*得______________________________
④方程两边开方得____________________________________
⑤x1=__________,x2=__________.
【回答】
x2-2x-=0 x2-2x= x2-2x+1= (x-1)2=+1 -+1
知识点:解一元二次方程
题型:填空题