已知多项式2x²+3xy-2y²-x+8y-6的值恒等于.如题2x²+3xy-2y²+A(2x-y)+B(x+2y)+AB请问A+B的值是多少?
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/29 15:49:12
![已知多项式2x²+3xy-2y²-x+8y-6的值恒等于.如题2x²+3xy-2y²+A(2x-y)+B(x+2y)+AB请问A+B的值是多少?](/uploads/image/z/2521321-25-1.jpg?t=%E5%B7%B2%E7%9F%A5%E5%A4%9A%E9%A1%B9%E5%BC%8F2x%26%23178%3B%2B3xy-2y%26%23178%3B-x%2B8y-6%E7%9A%84%E5%80%BC%E6%81%92%E7%AD%89%E4%BA%8E.%E5%A6%82%E9%A2%982x%26%23178%3B%2B3xy-2y%26%23178%3B%2BA%282x-y%29%2BB%28x%2B2y%29%2BAB%E8%AF%B7%E9%97%AEA%2BB%E7%9A%84%E5%80%BC%E6%98%AF%E5%A4%9A%E5%B0%91%3F)
x){}K.rΧ{*Ԕ
-+*u*!
mJ]Z6y8'.kzhVڎFNF@/sv3c=ҧ&$S~*Ef
>{m\4Ҭ N0u6<ٽb(P!
Tdkf::8C8@}6yv
已知多项式2x²+3xy-2y²-x+8y-6的值恒等于.如题2x²+3xy-2y²+A(2x-y)+B(x+2y)+AB请问A+B的值是多少?
已知多项式2x²+3xy-2y²-x+8y-6的值恒等于.
如题2x²+3xy-2y²+A(2x-y)+B(x+2y)+AB请问A+B的值是多少?
已知多项式2x²+3xy-2y²-x+8y-6的值恒等于.如题2x²+3xy-2y²+A(2x-y)+B(x+2y)+AB请问A+B的值是多少?
2x²+3xy-2y²-x+8y-6=2x²+3xy-2y²+A(2x-y)+B(x+2y)+AB
2x²+3xy-2y²-x+8y-6=2x²+3xy-2y²+(2A+B)x+(2B-A)y+AB
所以
2A+B=-1
2B-A=8
AB=-6
所以
A=-2,B=3
A+B=1