作业帮求6x²y+2xy-3x²y²-7x-5yx-4y²x²-6x²y得值,其中|x+3|+(y-½)²=0
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求6x²y+2xy-3x²y²-7x-5yx-4y²x²-6x²y得值,其中|x+3|+(y-½)²=0
求6x²y+2xy-3x²y²-7x-5yx-4y²x²-6x²y得值,其中|x+3|+(y-½)²=0
求6x²y+2xy-3x²y²-7x-5yx-4y²x²-6x²y得值,其中|x+3|+(y-½)²=0
6x²y+2xy-3x²y²-7x-5yx-4y²x²-6x²y |x+3|+(y+1/2)²=0 x=-3 y=1/2
=-3xy-7x²y²-7x=-x(3y+7xy²+7)=3(3/2-21/4+7)=12