Question

exercițiul 13 va rog mult

Answer 1

c+c+c+c=364
c=364:4
c=91
b=6xc
b=6x91
b=546
a=2xb
a=2x546
a=1092
A). (a+b):c = (1092+546):91 =1638 : 91 =18
B) (a+ b + c ) : c = (1092+ 546 +91 ): 91 =(1638+ 91):91 =1729:91 =19
C) (a-b):c=(1092-546):91=546:91=6
Cu placere !

Answer 2

$\it b=6c\ \ \ \ (1)\\ \\ a=2b\stackrel{(1)}{\Longrightarrow}\ a=12c \ \ \ \ (2)\\ \\ (1),\ (2) \Longrightarrow\ (a+b):c=(12c+6c):c=18c:c=18\\ \\ (1),\ (2) \Longrightarrow\ (a-b):c=(12c-6c):c=6c:c=6$