а). Р=70+60+(70-20)+10+20+(60-10)=130+50+30+50=260
S=70*60-20*10=4200-200=4000
б). Р=25*2+10*2+20+60*2+(25+20+25)=50+20+20+120+70=280
S=(25+20+25)*60-20*10=70*60-200=4200-200=4000
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а). Р=70+60+(70-20)+10+20+(60-10)=130+50+30+50=260
S=70*60-20*10=4200-200=4000
б). Р=25*2+10*2+20+60*2+(25+20+25)=50+20+20+120+70=280
S=(25+20+25)*60-20*10=70*60-200=4200-200=4000