已知x+2y=4,xy=-2,求3x+2xy+6y的值,

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已知x+2y=4,xy=-2,求3x+2xy+6y的值,已知x+2y=4,xy=-2,求3x+2xy+6y的值,已知x+2y=4,xy=-2,求3x+2xy+6y的值,原式=3(x+2y)+2xy=3

已知x+2y=4,xy=-2,求3x+2xy+6y的值,
已知x+2y=4,xy=-2,求3x+2xy+6y的值,

已知x+2y=4,xy=-2,求3x+2xy+6y的值,
原式=3(x+2y)+2xy
=3×4+2×(-2)
=8

3x+2xy+6y
=2xy+3（x+2y）
=-4+12
=8