已知xy+1/x=3,y^2+xy=6则3/x+5xy+2y^2的值是多少
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已知xy+1/x=3,y^2+xy=6则3/x+5xy+2y^2的值是多少
已知xy+1/x=3,y^2+xy=6则3/x+5xy+2y^2的值是多少
已知xy+1/x=3,y^2+xy=6则3/x+5xy+2y^2的值是多少
3/x+5xy+2y^2
=3(1/x+xy)+2(y^2+xy)
=3*3+2*6
=9+12
=21
21
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已知xy+1/x=3,y^2+xy=6则3/x+5xy+2y^2的值是多少急