已知x+y=12,xy=9求答

(x²+3xy+2y²)/(x²y+2xy²)=[(x+y)(x+2y)]/[xy(x+2y)]=(x+y)/(xy)=12/9=4/3很高兴为您解答,【the 1900】团队为您答题。请点击下面的【选为满意回答】按钮。