（先化简,再求值）3x²y-【5x²y+2（x²y-1/2）+x²y】+6x&#

学习时间:2026-05-13 23:10:11 阅读：2819

（先化简,再求值）3x²y-【5x²y+2（x²y-1/2）+x²y】+6x²y的值,其中x=-2,y=1/2

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2026-05-13 23:10:11

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3x²y-【5x²y+2（x²y-1/2）+x²y】+6x²y=3x²y-【5x²y+2x²y-1+x²y】+6x²y=3x²y-8x²y+1+6x²y=x²y+1=(-2)²*(1/2)+1=4*1/2+1=2+1=3