Привести к общему знаменателю.Помогите пожалуйста решить.
1) 1/15 и 1/5; 7/16 и 3/8; 11/14 и 13/140; 15/16 и23/192;
2) 7/10 и 2/9; 13/15 и7/8; 3/10 и 17/9; 7/13 и 8/15;
3) 1/4 и 1/3; 2/3 и 3/4; 1/2 и 3/7; 3/5 и 5/6; 7/10 и 2/9;
4) 1/12 и 1/7; 7/15 и 3/4; 5/11 и 2/13; 6/17 и3/10; 4/15 и7/11;
5) 1/2 *1/3 и 1/5; 2/3*4/5 и3/4; 1/3*1/5 и 4/7;
6) 7/10*2/3 и 10/11; 3/4*5/9 и 3/7; 4/5*5/7 и 7/9;

1.1/5=3/153/8=6/1611/14=110/14015/16=180/1922.7/10=63/902/9=20/9013/15=104/1207/8=105/1203/10=27/9017/9=170/907/13=105/1958/15=104/1953.1/4=3/121/3=4/122/3=8/123/4=9/121/2=7/143/7=6/143/5=18/305/6=25/307/10=63/902/9=20/904.1/12=7/841/7=12/847/15=28/603/4=45/605/11=65/1432/13=22/1436/17=60/1703/10=51/1704/15=44/1657/11=105/1655.1/2=15/301/3=10/301/5=6/302/3=40/604/5=48/603/4=45/601/3=35/1051/5=21/1054/7=60/1066.7/10=231/3302/3=220/33010/11=300/3303/4=189/2525/9=140/2523/7=108/2524/5=252/3155/7=225/3157/9=245/315