Question

докажите что a+2b=3c и b+2c3a ,то с+2a=3b

Answer 1

a + 2b = 3c
b + 2c = 3a
•••••••••••••
a = 3c - 2b
b + 2c = 3( 3c - 2b )
b + 2c = 9c - 6b
7b = 7c
b = c
a = 3c - 2c = c
a = b = c
••••••••••
c + 2a = 3b
b + 2b = 3b
3b = 3b