Question

Cine poate să-mi facă ex 2? Dau 5 STELE ​

Answer 1

Răspuns:

Explicație pas cu pas:

a)

(3/4)*(x/y) = (3/4)*(2/5) = 3/10

b)

(3x + 2y)/3y = 3x/3y + 2x/3y = x/y + (2/3)*(x/y) = 2/5 + (2/3)*(2/5) = 2/5 + 4/15

= 6/15 + 4/15 = 10/15 = 2/3

c)

x/y = 2/5

x = 2y/5

2x + 3y = 4y/5 + 3y = 4y/5 + 15y/5 = 19y/5

7x - 2y = 14y/5 - 2y = 14y/5 - 10y/5 = 4y/5

(19y/5)/(4y/5) = (19y/5)*(5/4y) = 19/4