Приведите дробь к общему знаменателю 2/15 и5/12,512и7/8,7/33и3/77,2/55и5/22,1/72и1/56,1/42и1/54,9/35и11/42

2/15  и 5/122*4/(15*4) и 5*5/(12*5)8/60 и 25/605/12 и 7/85*2/(12*2) и 7*3/(8*3)10/24 и 21/247/33 и 3/777*7/(33*7) и 3*7/(77*3)49/231 и 21/2312/55 и 5/222*2/(55*2) и 5*5/(22*5)4/110 и 25/1101/72 и 1/561*7/(8*9*7) и 1*9/(7*8*9)7/504 и 9/5041/42 и 1/541*9/(7*6*9) и 1*7/(7*6*9)9/378 и 7/3789/35 и  11/429*6/(7*5*6) и 11*5/(7*5*6)54/210 и 55/210