f.2 maths(快入)

2007-08-06 11:46 pm

(2x+3)2次方
=?
(x-5)2次方
=?
(x+2)(x-2)
=?
(3x-6)2次方
=?

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回答 (4)

2007-08-07 12:05 am

✔ 最佳答案

(2x+3)^2

= 4x^2+12x+9

(x-5)^2

= x^2-10x+25

(x+2)(x-2)

= x^2-4

(3x-6)^2

= 9x^2-36x+36

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2007-08-07 1:56 am

(2x+3)2次方=4x2次方+9
(x-5)2次方=x2次方-25
(x+2)(x-2)=x2次方-4
(3x-6)2次方=9x2次方-36

參考: ME

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2007-08-06 11:57 pm

(2x+3)2次方
= 2x² + 3²
= 2x² + 9

(x-5)2次方
= x² - 5²
= x² + 25

(x+2)(x-2)
= (x)(x) + (x)(-2) + (+2)(x) + (+2)(-2)

(3x-6)2次方
= 3x² - 6²
= 3x² + 36

參考: I got distinction for the 2007 International Competitions in Australia. 唔信??? 去 http://www.eaa.unsw.edu.au 查查有冇哩樣嘢嘅存在。

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2007-08-06 11:52 pm

1) 4x^2+12x+9

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