Form1數學!急要!

2007-11-17 11:56 pm
假如x=2分之一,1加二分之x三次方減2乘x二次方等於幾多?

回答 (2)

2007-11-18 12:04 am
✔ 最佳答案
X = 1/2
1 + (x³)/2 - (2)(x²)
= 1 + (1/2)³/2 - (2)(1/2)²
= 1 + (1/8)/2 - (2) (1/4)
= 1+ (1/16) - 1/2
= 16/16 + 1/16 - 8/16
= 9/16
2007-11-18 12:01 am
可唔可以用數字打出黎..好難明...對唔住


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