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Pb=6,8*2,4+6,8*2,4+3,5*6,8+3,5*6,8=80,24
P=80,24+8,4+8,4=97,04
b)
Pb=5*8,4*4=168
P=168+25+25=218
c)
Pb=4*3,5*3,5=49
P=49+12,25+12,25=73,5