szerokosc prostokata jest rowna 12i3/4 dm , adługosc o 3i1/5 dm dłuższa od szerokości . Oblicz obwód prostakąta .
12 3/4 + 3 1/5 = 12 75/100 + 3 20/100= 15 95/100dm
12 75/100*2 + 15 95/100*2 = 25 50/100 + 31 10/100 = 56 60/100 = 56 3/5dm
12 3/4 +3 1/5 =12 15/20 +3 4/20=15 19/20
15 19/20*2+12 15/20*2=31 9/10+24 5/10=55 16/10=56 6/10
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12 3/4 + 3 1/5 = 12 75/100 + 3 20/100= 15 95/100dm
12 75/100*2 + 15 95/100*2 = 25 50/100 + 31 10/100 = 56 60/100 = 56 3/5dm
12 3/4 +3 1/5 =12 15/20 +3 4/20=15 19/20
15 19/20*2+12 15/20*2=31 9/10+24 5/10=55 16/10=56 6/10