x-y=-3,xy=2,则2x²y²-x+y的值

问题描述:

x-y=-3,xy=2,则2x²y²-x+y的值

冰菊的花瓣
2x²y²-x+y
=2(xy)²-(x-y)
=2×(2)²-(-3)
=8+3
=11