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分解因式要写过程急会的快进啊呜呜

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0 | 2010-3-3 16:04:18 | 显示全部楼层 |阅读模式

5.-x^2+1/4 =1/4-x^2 =(1/2-x)(1/2+x)6.m^2n^4-a^4b^2 =(mn^2-a^2b)(mn^2+a^2b)7.(4x-3y)^2-16y^2 =((4x-3y)-4y)((4x-3y)+4y) =(4x-3y-4y)(4x-3y+4y) =(4x-7y)(4x+y)8.121x^2-169(x-3y)^2 =(11x-13(x-3y))(11x+13(x-3y)) =(11x-13x+39y)(11x+13x-39y) =(-2x+39y)(24x-39y)9.(x+2y)^2-(2x-y)^2 =((x+2y)-(2x-y))((x+2y)+(2x-y)) =(x+2y-2x+y)(x+2y+2x-y) =(3y-x)(3x+y)10.-4(x+2y)^2+9(2x-y)^2=9(2x-y)^2-4(x+2y)^2=(3(2x-y)-2(x+2y))(3(2x-y)+2(x+2y))=(6x-3y-2x-4y)(6x-3y+2x+4y)=(4x-7y)(8x+y)

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