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80 i 4 wychodzi 20 ( to w ułamku)
80*5= 400
a 4:4 = 1 i masz wynik :)
tylko wszystko zapisac w ulamku ;d
y -dzielnik
x : y = 20 , ---------> x = 20y
5x :(y :4) = ?
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5*20y : (y :4) =100y : (y/4) = 100y *(4/y) = 100*4 = 400
II sposób: 5*4 *20 = 20*20 = 400