(先化简,再求值)3x²y-【5x²y+2(x²y-1/2)+x²y】+6x
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(先化简,再求值)3x²y-【5x²y+2(x²y-1/2)+x²y】+6x²y的值,其中x=-2,y=1/2
![(先化简,再求值)3x²y-【5x²y+2(x²y-1/2)+x²y】+6x](/uploads/image/z/1601148-12-8.jpg?t=%EF%BC%88%E5%85%88%E5%8C%96%E7%AE%80%2C%E5%86%8D%E6%B1%82%E5%80%BC%EF%BC%893x%26%23178%3By-%E3%80%905x%26%23178%3By%2B2%EF%BC%88x%26%23178%3By-1%2F2%EF%BC%89%2Bx%26%23178%3By%E3%80%91%2B6x%26%23)
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
=3x²y-【5x²y+2x²y-1+x²y】+6x²y
=3x²y-8x²y+1+6x²y
=x²y+1
=(-2)²*(1/2)+1
=4*1/2+1
=2+1
=3
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