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P=a*b=3 3/4 * 5 1/8=15/4*41/8=615/32=19 7/32 j2
obwód:
Ob=2*15/4 + 2*41/8=15/2+41/4=30/4+41/4=71/4=17 3/4 j
Obw= 2x15/4+2x41/8
Obw= 30/4+41/4
Obw= 71/4
Obw= 17 3/4
P=3 3/4x 5 1/8
P=15/4x41/4
P=615/16
P=38 7/16