Question

Afla valorile literelor a,b si c,stiind ca:
a) 10a+10b+10c=2530
a+b=196
a+c=177
b) 5a+2b+2c=70
3a+2b=44
c=3

Answer 1

a) 10(a+b+c)=2530
10(196+c)=2530
196+c=2530:10
196+c=253
c=253-196
c=57
a+57=177
a=177-57
a=120
120+b=196
b=196-120
b=76

b) 2b=44-3a
5a+2b+6=70
5a+2b=70-6
5a+2b=64
5a+44-3a=64
2a=64-44
2a=20
a=20:2
a=10
2b=44-30
2b=14
b=14:2
b=7

Answer 2

A)
= 10 ( a+b+c) = 2530
a+b+c= 2530:10= 253
a+ b= 196
C= 253-196= 57
A+c= 177
A= 177-57= 120
B= 196-120=76
Proba ?
1200+760+570 = 2530

b)
= 2a+2c= 70-44= 26
2(a+c)= 26
A+c= 26:2= 13
A= 13-3= 10
2b= 44-3x10
2b= 14
b= 14:2= 7