# 雅虎香港 搜尋

廣告

1. ### f .3 probablity ( one )

Question A bag contains n black balls and 20 white balls. If a ball is randomly drawn from the bag. the probability of drawing a black ball is 1/5. Find n. Solution There are (n+20) balls...

目錄：科學及數學 > 數學 2013年08月30日

2. ### F .5inequalities in one unknown

1a) x^2 +7x + 15 >0 since for x^2 +7x + 15 =0 have no real roots and a>0 x can be all real number 1b) 3x^2 -8x +6 ≤ 0 since for 3x^2 -8x +6 = 0 have no real roots and a>0 x have no real solution. 2010-10-03 12:35:19 補充： Given that an equation ax^2 +bx + c = 0 have no real root Case I...

目錄：科學及數學 > 數學 2010年10月14日

3. ### Mathematic F .1 ( One question)

Some of the possible solutions are 75, 86, 97. First , you could write all the solutions, eg, 31, 42, 53, 64, 75, 86, 97and then cross out all the incorrect solutions.

目錄：科學及數學 > 數學 2008年08月09日

4. ### F .1 maths( one que.)

e種問題會比埋有邊2種coins，如果唔係唔會有答案，我就當係\$5 coins吧 let the number of \$2 coins be y , then we have the number of \$5 coins be 135-y thus we have (135-y)(5)+(2)(y)=348 675-5y+2y=348 3y...

目錄：科學及數學 > 數學 2013年07月21日

5. ### Maths F .1 one question only

Cost of each oranges = \$4000/5000 = \$0.8 Selling price per orange at 40% discount on the cost = \$0.8 x (1 – 40%) = \$0.48 (a) Total income = 4000 x \$1.2 + 1000 x \$0.48 = \$4800 + \$480 = \$5280 (b) Percentage of profit = (5280 – 5000)/5000 x 100% = 5.6%

目錄：科學及數學 > 數學 2010年02月01日

6. ### Mathematic F .1 ( One question) Percentage

The final selling price is \$850 x (1+35%) = \$850 x 1.35 = \$1147.5 Strategy 1: 10% discount was given, the marked-up price is \$1147.5 / (1-10%) = \$1147.5 / 0.9 = \$1275 the marked price was increased by (1275- 1147.5)/1147...

目錄：科學及數學 > 數學 2008年08月09日

7. ### f .3 maths~ one question only

1/(2+√3) <-[Times (2-√3) both numerator and denominator] =(2-√3)/[(2+√3)(2-√3) =(2-√3)/[2²-(√3)²] =(2-√3)/1 =2-√3

目錄：科學及數學 > 數學 2011年09月06日

8. ### MATHS( f .2) only one question

49 − (2x −1)2 = [7 + (2x −1)][7 − (2x −1)] = (2x + 6)(8 − 2x ) ==&gt; (2x + 6) = 2( x + 3) ==&gt; (8 − 2x ) = 2 (4 − x ) = 2( x + 3) X 2 (4 − x ) = (2X2)( x + 3)(4 − x ) = 4( x + 3)(4 − x )

目錄：科學及數學 > 數學 2007年10月30日

9. ### MATHZ ( F .3) one Q before 6 p.m

６（ｒ－１）^２＋８（ｒ－１） ＝（ｒ－１）〔６（ｒ－１）＋８〕 ＝（ｒ－１）（６ｒ－６＋８） ＝（ｒ－１）（６ｒ...

目錄：科學及數學 > 數學 2008年09月10日

10. ### MATHZ ( F .3) one Q before 2:45 p.m

0.16m^2-1.2mn+2.25n^2 =(4/25)m^2-(2)(2/5)(3/2)+(9/4)n^2 =(2/5 m-3/2 n)^2//

目錄：科學及數學 > 數學 2008年09月07日

廣告