(X-1)(X-2)(X-3)(X-4)=?简便方法
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(X-1)(X-2)(X-3)(X-4) = [(x -1)(x-4)] * [(x-2)(x-3)] = [x^2 - 5x +4] * [[x^2 - 5x + 6] = (x^2 - 5x)^2 + (4 + 6)* (x^2 - 5x) + 4 * 6 = (x^2 - 5x)^2 + 10(x^2 - 5x) + 24 = x^2 - 10x^3 + 25x^2 + 10x^2 - 50x + 24 = x^4 - 10x^3 + 35x^2 - 50x + 24
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