因式分解练习,4x^2-9x-55,2x^2-5xy-12y^2,x^2+2xy+y^2-2x-2y+1,x^2-4xy+4y^2-z^2-2z-1,x^2y^2-x^2-y^2+1,x^2-4x-xy+2y+4
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因式分解练习,4x^2-9x-55,2x^2-5xy-12y^2,x^2+2xy+y^2-2x-2y+1,x^2-4xy+4y^2-z^2-2z-1,x^2y^2-x^2-y^2+1,x^2-4x-xy+2y+4
因式分解练习,
4x^2-9x-55,
2x^2-5xy-12y^2,
x^2+2xy+y^2-2x-2y+1,
x^2-4xy+4y^2-z^2-2z-1,
x^2y^2-x^2-y^2+1,
x^2-4x-xy+2y+4
因式分解练习,4x^2-9x-55,2x^2-5xy-12y^2,x^2+2xy+y^2-2x-2y+1,x^2-4xy+4y^2-z^2-2z-1,x^2y^2-x^2-y^2+1,x^2-4x-xy+2y+4
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4x^2-9x-55=(x-5)(4x+11)
2x^2-5xy-12y^2=(x-4y)(2x+3y)
x^2+2xy+y^2-2x-2y+1=(x+y)²-2(x+y)+1 =(x+y-1)²
x^2-4xy+4y^2-z^2-2z-1=(x-2y)²-(z+1)² = (x-2y+z+1)(x-2y-z-1)
x^2y^2-x^2-y^2+1=x²(y²-1)-(y²-1)=(x²-1)(y²-1)=(x+1)(x-1)(y+1)(y-1)
x^2-4x-xy+2y+4=x^2-4x+4-xy+2y=(x-2)²-y(x-2)=(x-2)(x-2-y)