1)3*342+6*254=2550 книг.
2)P=2(a+b) = 2*(12+12-6) = 2*18=36
S=a*b = 12*(12-6)=12*6=72
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1)3*342+6*254=2550 книг.
2)P=2(a+b) = 2*(12+12-6) = 2*18=36
S=a*b = 12*(12-6)=12*6=72