初一数学化简题:先化简再求值:2(x²y+xy)-3(x²y-xy)-4x²y 其中x=-1,y=1
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2(x²y+xy)-3(x²y-xy)-4x²y
=2x²y+2xy-3x²y+3xy-4x²y
=-5x²y+5xy
=-5xy(x-1)
=-5*(-1)*1*(-1-1)
=5*(-2)
=-10
不懂可追问,有帮助请采纳,谢谢!
=2x²y+2xy-3x²y+3xy-4x²y
=-5x²y+5xy
=-5xy(x-1)
=-5*(-1)*1*(-1-1)
=5*(-2)
=-10
不懂可追问,有帮助请采纳,谢谢!
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