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2014-10-06T16:20:21+03:00
A+b=15
b+c=13
a+c=14
a) a+b+b+c+a+c=13+14+15
2a+2b+2c=42
a+b+c=21
3a+3b+3c=21*3
3a+3b+3c=63
b) 2a+3b+2c+3a+3b+3c=42+63
5a+5b+5c=105
c) c=13-b
a+13-b=14
a-b=1
a+b=15
a-b+a+b=15+1
2a=16
a=8
8+b=15
b=7
7+c=13
c=6
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2014-10-06T16:25:39+03:00
A+b=15
b+c=13
a+c=14
------------
2a+2b+2c=13+14+15
2a+2b+2c=42/:2
a+b+c=26

a) 3a+3b+3c=26*3
3a+3b+3c=78

b)5a+5b+5c=26*5
5a+5b+5c=130

c)  a=26-13
 a=13

b=15-13
b=2

c=26-15
c=11












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