已知x²+xy=2,y²+xy=5,则1/2x²+xy+1/2y²=( )已知x²+xy=2,y²+xy=5,则1/2x²+xy+1/2y²=( )
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![已知x²+xy=2,y²+xy=5,则1/2x²+xy+1/2y²=( )已知x²+xy=2,y²+xy=5,则1/2x²+xy+1/2y²=( )](/uploads/image/z/962607-39-7.jpg?t=%E5%B7%B2%E7%9F%A5x%26%23178%3B%2Bxy%3D2%2Cy%26%23178%3B%2Bxy%3D5%2C%E5%88%991%2F2x%26%23178%3B%2Bxy%2B1%2F2y%26%23178%3B%3D%EF%BC%88+%EF%BC%89%E5%B7%B2%E7%9F%A5x%26%23178%3B%2Bxy%3D2%2Cy%26%23178%3B%2Bxy%3D5%2C%E5%88%991%2F2x%26%23178%3B%2Bxy%2B1%2F2y%26%23178%3B%3D%EF%BC%88+%EF%BC%89)
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已知x²+xy=2,y²+xy=5,则1/2x²+xy+1/2y²=( )已知x²+xy=2,y²+xy=5,则1/2x²+xy+1/2y²=( )
已知x²+xy=2,y²+xy=5,则1/2x²+xy+1/2y²=( )
已知x²+xy=2,y²+xy=5,则1/2x²+xy+1/2y²=( )
已知x²+xy=2,y²+xy=5,则1/2x²+xy+1/2y²=( )已知x²+xy=2,y²+xy=5,则1/2x²+xy+1/2y²=( )
x²+2xy+y²=(x²+xy)+(y²+xy)=5+2=7
1/2x²+xy+1/2y²=1/2(x²+2xy+y²)=7/2
这是我在静心思考后得出的结论,
如果不能请追问,我会尽全力帮您解决的~
如果您有所不满愿意,请谅解~
x²+xy=2,y²+xy=5
∴1/2x²+xy+1/2y²
=1/2(x²+2xy+y²)
=1/2(x²+xy+xy+y²)
=1/2×﹙2+5)
=3.5