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____________
(10/3 - 2 1/5) * 0,9
=
43,2
__________
(50/15 - 2 3/15) *0,9
=
43,2
----------------------
-77/15 *9/10
=
43.2
________________
693/150
=
43,2 * 150/693 = około 9,35
z tego 23% wartości równe jest około 2,15