F.1兩條數學問題~~十萬火急~~10點!!幫幫手!!

Question

1.simplify(簡化)(俾埋steps):(上面係分子,下面係分母,唔好意思,冇左條分線)
  15XpXqXpXp二次方X4XqXq三次方  
     pXqXqX6Xq二次方XpXq二次方

                _________________________________________
 
            _________________________________________

            _________________________________________
            
            _________________________________________

            _________________________________________
2.Write down an algebraic expression to represent the nth term of each sequence.
  7,2,-3,-8,-13 ......

  The nth term
=________________

sir · Accepted Answer

1) 15 x p x q x p x p^2 x 4 x q x q^3 
   p x q x q x 6 x q^2 x p x q^2

= 15 x 4 x p x p x p^2 x q x q x q^3
   6 x p x p x q x q x q^2 x q^2

= 60 x p^4 x q^5
   6 x p^2 x q^6

= 10 p^2
    q

2) 7, 2, -3, -8, -13, ...

This is a A.P. with common difference -5

The nth term

= First Term + (n - 1) x common difference

= 7 + (n - 1) (-5)

= 12 - 5n

F.1兩條數學問題十萬火急10點!!幫幫手!!

1 Antwort