Ответ:
S=a*c+b*d
P=a+b+c+d+(a+b) +(c-d) =2a+2b+2c=2(a+b+c)
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Ответ:
S=a*c+b*d
P=a+b+c+d+(a+b) +(c-d) =2a+2b+2c=2(a+b+c)