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Afla numarul rational care inmultit cu 56pe 90 se obtine 5× 5pe 42

Răspuns :

x * 56/90 = 5 * 5/42 
56x/90 = 25/42 
56x = (25*90)/42
56x = 2250/42 
x = 2250/42 x 1/56 = 2250/2352 = 375/392
1/n=nr rational
1/n*56/90=25/42
56/90xn=25/42
simplificam prin 14 si 5
avem
4/18xn=5/3
5x18n=12
90n=12
n=12/90 
simplificam cu 6
n=2/15