问题标题:
【懂数学的求点拨,怎样由x²+xy-2y²=0得到=(2x-y)(x-y)求解怎样由x²+xy-2y²=0得到=(2x-y)(x-y)=0求解】
问题描述:
懂数学的求点拨,怎样由x²+xy-2y²=0得到=(2x-y)(x-y)求解
怎样由x²+xy-2y²=0得到=(2x-y)(x-y)=0求解
苏文印回答:
解x²+xy-2y²=0
(x²-y²)+(xy-y²)=0
(x+y)(x-y)+y(x-y)=0
(x-y)(x+y+y)=0
(x-y)(x+2y)=0
所以x-y=0x=y
或者x+2y=0x=﹣2y
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