高中数学-高考试题(上海交通大学 1931年代数式)

计算题（1931年上海交通大学）

Factor the following:

4a-16b+4a+1.

答案解析

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讨论

高中数学

Find the equation of the ruled surface whose generators are the system of the lines x-2y =4kx,k(x-2y)=4 and discuss the surface.

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线性代数

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北京师范大学代数式

代数式

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英：If (1-x)n=c0+c1 x+c2 x2+⋯+cn xn, find the value of c0+2c1+3c2+⋯+(n+1) cn.汉：若(1-x)n=c0+c1 x+c2 x2+⋯+cn xn,求c0+2c1+3c2+⋯+(n+1) cn之值.

Factor the following expressions: a(b + c)² + b(c + a)² + c(a + b)² - 4abc

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