已知xy=-2,X+Y=3,求（5Xy+10y)+[5X-（3Xy+2Y-3x)]的值

来源：学生作业帮助网 编辑：作业帮 时间：2024/04/30 22:54:26

已知xy=-2,X+Y=3,求（5Xy+10y)+[5X-（3Xy+2Y-3x)]的值
已知xy=-2,X+Y=3,求（5Xy+10y)+[5X-（3Xy+2Y-3x)]的值

已知xy=-2,X+Y=3,求（5Xy+10y)+[5X-（3Xy+2Y-3x)]的值
（5Xy+10y)+[5X-（3Xy+2Y-3x)]
=5Y(X+2)+(5X-3XY-2Y+3X)
=5YX+10Y+8X-3XY-2Y
=2XY+8Y+8X
=2*-2+8(x+y)
=-4+24
=20

（5Xy+10y)+[5X-（3Xy+2Y-3X)]
= 5Xy+10y + 5X-3Xy-2Y+3X
= 2Xy+8y + 8X
= 2Xy + 8(X+y)
= 2*(-2) + 8*3
= 20

等于20先打开括号得2XY+8（X+Y）之后把条件代入就好

已知xy^2=-2,求-xy（x^2y^5-xy^3-y)的值. 已知xy^2=-2 求-xy(x^2y^5-xy^3-y) 已知x^2-xy=5,xy-y^2=-3求3(x^2-xy)-xy+y^2 已知Y-x=3xy,求(5x+3xy-5y)÷(x-2xy-y) 已知xy/x+y=3,求代数式2x-5xy+2y/x-3xy+y 已知xy/x+y=2,求代数式3x-5xy+3y/-x+2xy-y的值 已知X+Y分之XY=2,求-X+3XY-Y分之3X+5XY+3Y 已知X-XY-2Y=0求2X+3XY-Y/X-2XY+5Y 已知xy=2(x+y),求(5x-xy+5y)/(3xy-x-y)的值 已知xy=2(x+y),求5x-xy+5y/3xy-x-y的值 已知x-y=3xy,求5x+2xy-5y/x-4xy-y的值 已知xy/x+y=2,求代数式8x-5xy+8y/-x+3xy-y的值 已知(x+1)²+|y-1|=0,求2(xy-5xy²)-(3xy²-xy)得值 已知xy^2=-2求xy（2x^3y^7+5x^2y 已知x^-xy=5,xy-y^=-3,求式子3(x^-xy)-xy+y^的值 已知x:y=3:2,求(x²+3xy)/(xy+2xy) 已知x^+xy=-5,xy+y^=8,求2x^-xy-3y^的值都是2次 已知x—xy=5,xy—y=-3,求x+y—2xy的值.