整式,3x^2-[2x^2y-(xy-x^2)]+4x^2y其中x=-1,y=-2

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整式,3x^2-[2x^2y-(xy-x^2)]+4x^2y其中x=-1,y=-2
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整式,3x^2-[2x^2y-(xy-x^2)]+4x^2y其中x=-1,y=-2
整式,
3x^2-[2x^2y-(xy-x^2)]+4x^2y其中x=-1,y=-2

整式,3x^2-[2x^2y-(xy-x^2)]+4x^2y其中x=-1,y=-2
3x^2-[2x^2y-(xy-x^2)]+4x^2y
=3x^2-[2x^2y-xy+x^2]+4x^2y
=3x^2-2x^2y+xy-x^2+4x^2y
=2x^2+2x^2y+xy
=2x^2(1+y)+xy
=x[2x(1+y)+y]
=(-1)[2(-1)(1-2)-2]
=(-1)[2(-1)(-1)-2]
=(-1)[2-2]
=0

6

提取公因式就是提取出两个式子中的相同的东西。