已知x-y=-3,xy=2则3x-5y-(x-3y-4xy)是多少
6个回答
3x-5y-(x-3y-4xy)
=3x-5y-x+3y+4xy
=2x-2y+4xy
=2(x-y)+4xy
=2×(-3)+4×2
=-6+8
=2
相关问题
已知x+y=5,xy=-1,则(3x-4y+2xy)-(2x-5y+5xy)=_______
已知x+y=3 x²+y²-3xy=4 则x³y+xy³=?
已知x+y=4,xy=-2,则(3x-2y-2xy)-(x-4y+xy)的值是多少
已知x-y=3xy,则[2x+3xy−2y/x−2xy−y]=______.
已知:x+y=3,xy=-2,求:1.(3x-4y+2xy)-(2x-5y+5xy)的值;2.(3x-5y+4xy)-(
已知x-3√(xy)-4y=0则(2x+3√(xy)-2y)/(3x-√(xy)+y)=?答案是14/15 ∵x-3√(
已知4/X-4/Y=3,则分式(2X+3XY-2Y)/(x-6xy-y)=?
已知2x-y/xy=2,则代数式4x+xy-2y/-2x+3xy+y的值是多少
已知:x/y=2/3,则(3x^2-2xy+5y^2)/(5x^2-3xy*3y^2)=
已知xy/(x+y)=2求(3x-5y+3y)/(-x+3xy-y)