作业帮(x-3)(x²-2)-(x-5)(3-x)-2(3-x)²
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(x-3)(x²-2)-(x-5)(3-x)-2(3-x)²
(x-3)(x²-2)-(x-5)(3-x)-2(3-x)²
(x-3)(x²-2)-(x-5)(3-x)-2(3-x)²
(x-3)(x²-2)-(x-5)(3-x)-2(3-x)²
=(x-3)(x²-2)+(x-5)(x-3)-2(x-3)²
=(x-3)[(x²-2)+(x-5)-2(x-3)]
=(x-3)(x²-2+x-5-2x+6)
=(x-3)(x²-x-1)
=(x-3)(x^2-2)+(x-5)(x-3)-2(x-3)^2
=(x^2-2+x-5-2x+6)(x-3)
=(x^2-x-1)(x-3)