来自姜洪权的问题
【已知2x2-3xy+y2=0(xy≠0),则xy+yx的值是()A.2,212B.2C.212D.-2,−212】
已知2x2-3xy+y2=0(xy≠0),则xy+yx的值是()
A.2,212
B.2
C.212
D.-2,−212
1回答
2020-02-01 01:58
【已知2x2-3xy+y2=0(xy≠0),则xy+yx的值是()A.2,212B.2C.212D.-2,−212】
已知2x2-3xy+y2=0(xy≠0),则xy+yx的值是()
A.2,212
B.2
C.212
D.-2,−212
根据题意,2x2-3xy+y2=0,且xy≠0,
故有(yx)