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標題: 請問.....有冇人識計呢條數？ [打印本頁]

作者: 五千萬 時間: 08-11-16 21:30 標題: 請問.....有冇人識計呢條數？

The owner of a store set the original price of a brand of shirt at $(200-b的2次方). He offered a $(2b2次方)discount on each
shirt and then sold(4+3b) of them. Express the amount he got in terms of b.

作者: cstchan 時間: 08-11-17 13:45

The selling price of a shirt
= (200-b^2)(1-2b^2)

The amount he got
=(4+3b)(200-b^2)(1-2b^2)

Expand the expression is the answer.

原帖由 五千萬 於 08-11-16 09:30 PM 發表
The owner of a store set the original price of a brand of shirt at $(200-b的2次方). He offered a $(2b2次方)discount on each
shirt and then sold(4+3b) of them. Express the amount he got in terms of b. ...

作者: 五千萬 時間: 08-11-17 23:12

原帖由 cstchan 於 08-11-17 13:45 發表
The selling price of a shirt
= (200-b^2)(1-2b^2)

The amount he got
=(4+3b)(200-b^2)(1-2b^2)

Expand the expression is the answer.

thank you

作者: Derdad 時間: 08-11-18 14:08

6b^5+8b^4-1203b^3-1604b^2+800...

請問係幾年班的數學呢？

原帖由 五千萬 於 08-11-17 23:12 發表

thank you

作者: 五千萬 時間: 08-11-18 21:34

form one

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