先化简，在求值：6x^2y+2xy-3x^2y^2-7x-5yx-4y^2x^2-6x^2y 其中|x+3|+(y-1\2）^2=0
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|x+3|+(y-1/2）^2=0
|x+3|=0,(y-1/2）^2=0
x=-3
y=1/2
6x^2y+2xy-3x^2y^2-7x-5yx-4y^2x^2-6x^2y
=6x^2y-6x^2y +2xy-5yx-3x^2y^2-4y^2x^2-7x
=-3xy-7x^2y^2-7x
=-3*(-3)*1/2-7*(-3)^2*(1/2)^2-7*(-3)
=9/2-63/4+21
=39/4
|x+3|=0,(y-1/2）^2=0
x=-3
y=1/2
6x^2y+2xy-3x^2y^2-7x-5yx-4y^2x^2-6x^2y
=6x^2y-6x^2y +2xy-5yx-3x^2y^2-4y^2x^2-7x
=-3xy-7x^2y^2-7x
=-3*(-3)*1/2-7*(-3)^2*(1/2)^2-7*(-3)
=9/2-63/4+21
=39/4
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