Приведите дроби к общему знаменателю.
1//10 и 1//15, 1//10 и 1//25, 1//30 и 1//40, 1//30 и 1//50, 7//33 и 3//77, 2//55 и 5//22, 4//15 и 3//20, 5//121 и 8//99.