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Cel mai inteligent răspuns!
2014-07-08T16:34:26+03:00
A+b= 7/4*3+8/5*3+...+20/17*3+1/3*4+2/3*5+...+14/3*17
grupam primul termen din a cu primul din b
a+b= (7+1)/4*3+(8+2)3*5+...+(20+14)/3*17
a+b= 8/4*3+10/3*5+...+34/3*17
a+b=1/3(8/4+10/5+...+34/17)
a+b=1/3(2+2+...+2)
a+b=1/3*2*14
a+b=28/3
7 4 7