x^2的系數在 (4x+7y)^2
coefficient of x^2 in (4x+7y)^2
係唔係16? (4x+7y)^2=16x^2+56xy+49y^2
呢s數係唔係要計個答案出黎先知到個係數?
系數coefficient
2008-10-12 3:52 am
回答 (2)
2008-10-12 7:23 am
✔ 最佳答案
x^2的系數在 (4x+7y)^2(7y+4x)^2
=(7y)^2+2(4x)(7y)+(4x)^2
The coefficient is 16, YOU ARE CORRECT!!!
參考: my maths knowledge
2008-10-12 4:12 am
x^2的系數在 (4x+7y)^2
(7y+4x)^2
=(7y)^2+2(4x)(7y)+(4x)^2
yes, the coefficient is 16!
如果剩係獨立(yx+q)^n, 哩一種就係, 直接代r+1公式
如果係(ax^2+bx+y)^n, 哩一種就唔得, 要慢慢爆同埋分析
(7y+4x)^2
=(7y)^2+2(4x)(7y)+(4x)^2
yes, the coefficient is 16!
如果剩係獨立(yx+q)^n, 哩一種就係, 直接代r+1公式
如果係(ax^2+bx+y)^n, 哩一種就唔得, 要慢慢爆同埋分析
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