Răspunsuri

2014-09-28T14:57:19+03:00
A) a+b=20 b+c=30 =>
3a+7b+4c=3a+3b+4b+4c=20*3+30*4=60+120=180
B)a+b=33 a+c=11 =>
5a+3b+2c=3a+3b+2a+2c=99+22=121
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