20.Oblicz:
4 5/9 + 2 1/3 x 4 1/2=
5 1/7 x 1 4/9 - 6 : 4 2/3=
3 1/2 x (2 1/4 - 1 1/2 : 6)=
5 2/9 - 1 1/6
___________
3 2/3 x (1 1/4 - 1/2)=
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4 5/9 + 2 1/3 x 4 1/2=
=41/9+21/2=82/18+189/18=271/18=15 1/18
5 1/7 x 1 4/9 - 6 : 4 2/3=
=52/7-6*3/14=52/7-9/7=43/7=6 1/7
3 1/2 x (2 1/4 - 1 1/2 : 6)=
=7/2*(9/4-1/4)=7/2*8/4=7/2*2=7
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