二项式系数:在(1+2*根号x)^3(1-三次根号x)^5中含x 项的系数A -6 B -3 C 0 D 3我的想法是C(2,3)*(2根号x)²=12x-C(3,5)*(3次根号x)^3=-20x最终:12x-20x=-8x 系数为8 莫名其妙
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![二项式系数:在(1+2*根号x)^3(1-三次根号x)^5中含x 项的系数A -6 B -3 C 0 D 3我的想法是C(2,3)*(2根号x)²=12x-C(3,5)*(3次根号x)^3=-20x最终:12x-20x=-8x 系数为8 莫名其妙](/uploads/image/z/1088657-17-7.jpg?t=%E4%BA%8C%E9%A1%B9%E5%BC%8F%E7%B3%BB%E6%95%B0%EF%BC%9A%E5%9C%A8%281%2B2%2A%E6%A0%B9%E5%8F%B7x%29%5E3%281-%E4%B8%89%E6%AC%A1%E6%A0%B9%E5%8F%B7x%29%5E5%E4%B8%AD%E5%90%ABx+%E9%A1%B9%E7%9A%84%E7%B3%BB%E6%95%B0A+-6+B+-3+C+0+D+3%E6%88%91%E7%9A%84%E6%83%B3%E6%B3%95%E6%98%AFC%282%2C3%29%2A%EF%BC%882%E6%A0%B9%E5%8F%B7x%EF%BC%89%26%23178%3B%3D12x-C%283%2C5%29%2A%283%E6%AC%A1%E6%A0%B9%E5%8F%B7x%29%5E3%3D-20x%E6%9C%80%E7%BB%88%EF%BC%9A12x-20x%3D-8x+%E7%B3%BB%E6%95%B0%E4%B8%BA8+%E8%8E%AB%E5%90%8D%E5%85%B6%E5%A6%99)
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