化简并求值2(x^2y+xy)-3(x^2y+xy)-4x^2y,其中x=-2,y=1/2

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化简并求值2(x^2y+xy)-3(x^2y+xy)-4x^2y,其中x=-2,y=1/2

化简并求值2(x^2y+xy)-3(x^2y+xy)-4x^2y,其中x=-2,y=1/2
化简并求值2(x^2y+xy)-3(x^2y+xy)-4x^2y,其中x=-2,y=1/2

化简并求值2(x^2y+xy)-3(x^2y+xy)-4x^2y,其中x=-2,y=1/2
2(x^2y+xy)-3(x^2y+xy)-4x^2y
=2x^2y+2xy-3x^2y-3xy-4x^2y
=-5x^2y-xy
=-10+1
=-9