1.Oblicz w pamięci :
1 1/2 (jeden i jedna druga) + 1/4(jedna czwarta)
3 3/4 (trzy i trzy czwarte) - 1/2(jedna druga)
10 3/4 - 2 1/2 =
5 1/4 + 3 1/2
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1 3/4
3 1/4
8 1/4
8 3/4
1 1/2 (jeden i jedna druga) + 1/4(jedna czwarta)=1i 3/4
3 3/4 (trzy i trzy czwarte) - 1/2(jedna druga)=3 1/4
10 3/4 - 2 1/2 =-8 1/4
5 1/4 + 3 1/2=8i3/4