Question

Oblicz pole narysowanego prostokata !! Pilne potrzebne na zaraz ! potrzebny uklad rownan !!

Answer 1

Dane :

a = 25x

a = 5y +3

 

b= 2x + 2/5

b = 2y

 

25x = 5y + 3

2x + 2/5 = 2y   /*5

 

25x – 5y = 3

10x  + 2 = 10y

 

25x – 5y = 3     /*(-2)

10x – 10y = -2

 

-50x + 10y = -6

10x -10y = -2

  ------------------- 

-40x = -8    /: (-40)

x = 8/40

x = 1/5

 

25*1/5 = 5y + 3

5 = 5y + 3

5y = 5 – 3

5y = 2  /: 5

y = 2/5

 

x = 1/5

y = 2/5

 

bok :

a = 25x = 25 * 1/5 = 5

a = 5y + 3 = 5 * 2/5 + 3 = 2+3 = 5

 

bok:

b = 2x + 2/5 = 2 *1/5 + 2/5 = 2/5 + 2/5 = 4/5

b = 2y = 2 *2/5 = 4/5

 

P= a*b

P = 5 * 4/5 = 4