4( x-y)^2- 16(x+y)^2因式分解答案为:-4(x+3y)(3x+y)要明确的过程!
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4( x-y)^2- 16(x+y)^2因式分解答案为:-4(x+3y)(3x+y)要明确的过程!
4( x-y)^2- 16(x+y)^2因式分解答案为:-4(x+3y)(3x+y)要明确的过程!
4( x-y)^2- 16(x+y)^2因式分解答案为:-4(x+3y)(3x+y)要明确的过程!
您好:
4( x-y)^2- 16(x+y)^2
=4【(x-y)²-4(x+y)²】
=4(x-y+2x+2y)(x-y-2x-2y)
=4(3x+y)(-x-3y)
=-4(x+3y)(3x+y)
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4( x-y)^2- 16(x+y)^2
=[2( x-y)]^2- [4(x+y)]^2 再运用完全平方公式展开就行了!
=[2(x-y)+4(x+y)][2(x-y)-4(x-y)]
=-4(x+3y)(3x+y)