神马作文网(x^2-7x)^2+6x-42x
来源：学生作业帮 编辑：神马作文网作业帮 分类：数学作业 时间：2024/11/19 18:19:13
(x^2-7x)^2+6x-42x
25x^2-16y^2-4z+16yz
25x^2-16y^2-4z+16yz
(x^2-7x)^2+6x-42
=[x(x-7)]^2+6[x-7]
=[x-7][x^2(x-7)+6 ]
=[x-7][x^3-7x^2+6]
=[x-7][x^2(x-1)-6(x^2-1)]
=[x-7][x^2(x-1)-6(x+1)(x-1)]
=[x-7][(x-1)(x^2-6x-6)]
25x^2-16y^2-4z^2+16yz
=25x^2-4[4y^2-4yz+z^2]
=25x^2-4[2y-z]^2
=[5x+2(2y-z)][5x-2(2y-z)]
=[5x+4y-2z][5x-4y+2z]
=[x(x-7)]^2+6[x-7]
=[x-7][x^2(x-7)+6 ]
=[x-7][x^3-7x^2+6]
=[x-7][x^2(x-1)-6(x^2-1)]
=[x-7][x^2(x-1)-6(x+1)(x-1)]
=[x-7][(x-1)(x^2-6x-6)]
25x^2-16y^2-4z^2+16yz
=25x^2-4[4y^2-4yz+z^2]
=25x^2-4[2y-z]^2
=[5x+2(2y-z)][5x-2(2y-z)]
=[5x+4y-2z][5x-4y+2z]
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x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少?
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计算：(x+7)(x-6)-(x-2)(x+2)
27046=2x( )+7x( )+4x( )+6x( )
(x+7)(x+6)-(x-2)(x+1)=?
2706=2x( )+7x( )+4x( )+6x( )
47026=4x()+7x()+2x()+6x()
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