Oblicz : [( 2,5 - 1 i jedna dziewiąta) : pięć dwunastych ] + [ ( 3 i dwie trzecie + 1,8) *pięć czterdziestych
[(2,5-1 1/9):5/12]+[(3 2/3 +1.8)*5/40]=[(2 9/18 - 1 2/18):5/12]+[(3 10/15 + 1 12/15)*5/40]=[(1 7/18)*12/5]+[(4 22/15)*5/40]=[25/18*12/5]+[82/15*5/40]=
=3 1/3+82/120=3 40/120+82/120=4 2/120=4 1/60
[(2 1/2 - 1 1/9): 5/12]+[(3 2/3 + 1 8/10)• 5/40]=
[(2 9/18 - 1 2/18) : 5/12]+[(3 20/30 + 1 24/30])• 5/40]=
[1 7/18 : 5/12]+[4 44/30• 5/40]=
25/18 : 5/12 + [4 22/15•5/40]=
25/18•12/5(tu się skraca) + [5 7/15•5/40]=
15/4 + [82/15•5/40]=
15/4+ 82/120=
15/4+41/60=
225/60+41/60=
266/60=
133/30=
4 13/30
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[(2,5-1 1/9):5/12]+[(3 2/3 +1.8)*5/40]=[(2 9/18 - 1 2/18):5/12]+[(3 10/15 + 1 12/15)*5/40]=[(1 7/18)*12/5]+[(4 22/15)*5/40]=[25/18*12/5]+[82/15*5/40]=
=3 1/3+82/120=3 40/120+82/120=4 2/120=4 1/60
[(2 1/2 - 1 1/9): 5/12]+[(3 2/3 + 1 8/10)• 5/40]=
[(2 9/18 - 1 2/18) : 5/12]+[(3 20/30 + 1 24/30])• 5/40]=
[1 7/18 : 5/12]+[4 44/30• 5/40]=
25/18 : 5/12 + [4 22/15•5/40]=
25/18•12/5(tu się skraca) + [5 7/15•5/40]=
15/4 + [82/15•5/40]=
15/4+ 82/120=
15/4+41/60=
225/60+41/60=
266/60=
133/30=
4 13/30