Question

rezolva urmatoarele cerinte :
a)afla nr. a , daca ab+ac=520 si b+c=52
b)afla nr a , daca ab-ac=45 si b-c=9
c)afla suma b+c daca ab+ac+70=170 si a = 25
d)afla diferenta b-c daca ab-ac-48=2 si a=10

Answer 1

a) ab + ac = 520
a x ( b + c ) = 520
a x 52 = 520
a = 10

b) ab + ac = 45
a x ( b + c ) = 45
a x 9 = 45
a = 5

c) ab + ac + 70 = 170
a x ( b + c ) = 170 - 70
25 x ( b + c ) = 100
b + c = 4

d) ab + ac - 48 = 2
a x ( b + c ) = 48 + 2
10 x ( b + c ) = 50
b - c = 5

Succes !!!