中一數學 (plz~~)

👨🏻‍🏫 學術台數學

2008-06-26 1:16 am

1. y=4ab-b² / 4a

a=12 b=-1/2

2. 3x² /(3y)²

3.(m x n + n x n) /2

4.( u + v) / (2u + 3v)

5. 3a² /( u x 2 - v x 4)

回答 (2)

2008-06-26 2:39 am

✔ 最佳答案

(1) y=4(12)(-0.5)-(-0.5)^2/4(12)
y=-0.505(取至三位有效數字)

(2) 3x^2/9y^2
=x^2/3y^2

(3)(mn+n^2)/2
=n(m+n)/2

(5) 3a^2/(2u-4v)
=3a^2/2(u-2v)

參考: myself

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2008-06-26 1:58 am

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