4(2x-y)²-9(x+3y)²
要用分解因式哦
4(2x-y)²-9(x+3y)²
要用分解因式哦
原式=[2(2x-y)+3(x+3y)][2(2x-y)-3(x+3y)]
=(4x-2y+3x+9y)(2x-2y-3x-9y)
=(7x+7y)(-x-11y)
=-7(x+y)(x+11y)
4(2x-y)²-9(x+3y)²
=[2(2x-y)+3(x+3y)][2(2x-y)-3(x+3y)]
=(4x-2y+3x+9y)(4x-2y-3x-9y)
=(7x+7y)(x-11y)
=7(x+y)(x-11y)
(8x-4y-3x-9y)(8x-4y+3x+9y)
=(5x-13y)(11x+5y)
4(2x-y)²-9(x+3y)²
=[2(2x-y)]²-[3(x+3y)]²
=(4x-2y+3x+9y)(4x-2y-3x-9y)
=(7x+7y)(x-11y)
=7(x+y)(x-11y)
4(2x-y)²-9(x+3y)²
=【2(2x-y)】²-【3(x+3y)】²
=(4X-2Y+3X+9Y)(4X-2Y-3X-9Y)
=(7X+7Y)(X-11Y)
=7(X+Y)(X-11Y)