急已知关于x,y的多项式ax²+2bxy+x²-x-2xy+y不含二次项,求5a-8b的值?
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急已知关于x,y的多项式ax²+2bxy+x²-x-2xy+y不含二次项,求5a-8b的值?
急
已知关于x,y的多项式ax²+2bxy+x²-x-2xy+y不含二次项,求5a-8b的值?
急已知关于x,y的多项式ax²+2bxy+x²-x-2xy+y不含二次项,求5a-8b的值?
a+1=0
2b-2=0
a=-1
b=1
5a-8b=-13