设:A=2x^2-3xy+y^2-x+2y B=4x^2-6xy+2y^2-3x-y ,若⼀x-2a⼀+(y+3)^2=0,且B-2A=a,求x,y的值

急急急
2024-11-07 13:17:49
推荐回答(1个)
回答1:

/x-2a/+(y+3)^2=0
可得 x=2a y=-3

把y代入A B
A=2x^2+8x+3
B=4x^2+15x+21