[機經] math jj-130
x, y are two even number,
function=2 (x^2)+ 4(y^2)
what's the greatest common factor of the value of this function?
A. 16
B. 8
C. 4
…………答案給8
我想算法應該是 function= 2(x^2+2y^2)
又x,y均為偶數,平方後可再提4,所以是8
我想問的是~
若x,y都為4,也是偶數,符合題目條件,但最大因數就會不只是8
我這樣想有錯嗎?還是我卡到陰~~請大大們解答
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