Question

aflati a si b stiind ca numerele a+b, b+7 , 5 sunt invers proportionale cu 4, 3 si 2

Answer 1

Răspuns:

4(a+b)=3(b+7)=2•5=k

k=10

a+b=10/4 sau a+b=5/2

b+7=10/3 =>b=10/3 - 7 =>b=(-11/3)

a - 11/3 = 5/2

a = 5/2 + 11/3

a = 37/6

Answer 2

Răspuns:

Explicație pas cu pas:

4(a + b) = 3(b + 7) = 10

3(b + 7) = 10, 3b + 21 = 10, 3b = -11, b = -11/3

4(a + b) = 10, 4(a - 11/3) = 10, 4a - 44/3 = 10, 4a = 74/3, a = 37/6