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2014-05-14T20:15:46+03:00
4a+4b+4c= 4(a+b+c)

a+b+c = 20+16 = 36 

4x36=144
1 2 1
2014-05-14T20:19:42+03:00
4a+4b+4c=4(a+b+c)=4(20+16)=4x36=144
2a+2b+ca+cb=2(a+b)+c(a+b)=2x20+16x20=40+3200=3240
1 2 1