帮我算几道初二分解因式的题分解因式:1.9x²-30xy+_______=(3x-__________)2.ax²+bx+c=(2x-1)(3x+2)则a=?b=?c=?以上二题为填空题 1.1/9a²-2/3a+12.(x²+4)²-16x²3.y²-9(x+y)²4.x(x-y)²-y(y

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