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2014-10-22T09:37:35+03:00
A+5(b+c)=18+5*57=18+285=303
3a+2b+2c=3*18+2(b+c)=54+2*57=54+114=168
a*b+a*c+7*b+7*c=a*(b+c)+7*(b+c)=18*57+7*57=1026+399=1425