Сведите к наименьшему общему знаменателю дробы. 5/24 и 11/40; 5/36 и 7/90; 17/100 и 11/250. Например так мы делали в классе: 2/15 и 19/50; 2/15 =20/150; 19/50= 57/150; 20/150 и 57/150.
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