1) Найдите НОД и НОК чисел: а) 48 и 72; б) 18 и 27; в) 40 и 56; г) 56 и 72.
2) Сократите дроби: 42/720; 75/300; 40/64; 120/180
3) Найдите значение выражения: (5(8/15) - 4(7/10))*2(2/3) - (5/9)
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