作业帮1.已知x+y=-4,xy=3,求5（2分之1xy+2y）+[6x-(2xy+y-3x)]的值2.已知（x+3）^2+|x-y+10|=0求代数式5x^2y-[2x^2y-(3xy-xy^2)-3x^2]-2xy^2-y^2的值
来源：学生作业帮助网 编辑：作业帮 时间：2024/11/15 13:01:41
![1.已知x+y=-4,xy=3,求5（2分之1xy+2y）+[6x-(2xy+y-3x)]的值2.已知（x+3）^2+|x-y+10|=0求代数式5x^2y-[2x^2y-(3xy-xy^2)-3x^2]-2xy^2-y^2的值](/uploads/image/z/1848148-52-8.jpg?t=1.%E5%B7%B2%E7%9F%A5x%2By%3D-4%2Cxy%3D3%2C%E6%B1%825%EF%BC%882%E5%88%86%E4%B9%8B1xy%2B2y%EF%BC%89%2B%5B6x-%282xy%2By-3x%29%5D%E7%9A%84%E5%80%BC2.%E5%B7%B2%E7%9F%A5%EF%BC%88x%2B3%EF%BC%89%5E2%2B%7Cx-y%2B10%7C%3D0%E6%B1%82%E4%BB%A3%E6%95%B0%E5%BC%8F5x%5E2y-%5B2x%5E2y-%283xy-xy%5E2%29-3x%5E2%5D-2xy%5E2-y%5E2%E7%9A%84%E5%80%BC)
1.已知x+y=-4,xy=3,求5（2分之1xy+2y）+[6x-(2xy+y-3x)]的值2.已知（x+3）^2+|x-y+10|=0求代数式5x^2y-[2x^2y-(3xy-xy^2)-3x^2]-2xy^2-y^2的值
1.已知x+y=-4,xy=3,求5（2分之1xy+2y）+[6x-(2xy+y-3x)]的值
2.已知（x+3）^2+|x-y+10|=0
求代数式5x^2y-[2x^2y-(3xy-xy^2)-3x^2]-2xy^2-y^2的值
1.已知x+y=-4,xy=3,求5（2分之1xy+2y）+[6x-(2xy+y-3x)]的值2.已知（x+3）^2+|x-y+10|=0求代数式5x^2y-[2x^2y-(3xy-xy^2)-3x^2]-2xy^2-y^2的值
1.已知x+y=-4,xy=3,求5(xy/2+2y)+[6x-(2xy+y-3x)]的值
5(xy/2+2y)+[6x-(2xy+y-3x)]
=5xy/2+10y+6x-2xy-y+3x
=xy/2+9y+9x
=xy/2+9(x+y)
=3/2-4=-5/2
2.已知(x+3) ²+|x-y+10|=0
求代数式5x²y-[2x²y-(3xy-xy²)-3x²]-2xy²-y²的值
(x+3)^2+|x-y+10|=0
(x+3)^2=0 |x-y+10|=0
x+3=0 x-y+10=0
x=-3 y=7
5x²y-[2x²y-(3xy-xy²)-3x²]-2xy²-y²
=5x²y-2x²y+(3xy-xy²)+3x²-2xy²-y²
=5x²y-2x²y+3xy-xy²+3x²-2xy²-y²
=3x²y+3xy-3xy²+3x²-y²
=3xy(x+1-y)+3x²-y²
=-3*3*7*(-3+1-7)+3*9-49
=545