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kiedys dla ulatwienia zapisywalam sobie w slupku, np
11 9
4 x
i po przekatnej
11x = 9 * 4
x = 9*4/11 = 36/11 = 3 3/11
2)
9/4=18/x
tutaj tak samo
9 18
4 x
9x = 18 * 4
x = 18*4/9
x = 2 * 4 = 8
to wszystko
11x=4*9
11x=36
x=3 i 3/11
9/4=18/x
9x=4*18
9x=72
x=8