1) 9/с+5/с= (9+5)/c=14/c
2)а/с+4/с=(a+4)/c
3)а/с+b/3c=3a/3c+b/3c=(3a+b)/3c
4)1/с+3/2с=2/2c+3/2c=(2+3)/2c=5/2c
5) d/ac+c/ad=d^2/acd+c^2/acd=(d^2+c^2)/acd
6)2а/3с+а/6с =4a/6c+a/6c=(4a+a)/6c=5a/6c
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1) 9/с+5/с= (9+5)/c=14/c
2)а/с+4/с=(a+4)/c
3)а/с+b/3c=3a/3c+b/3c=(3a+b)/3c
4)1/с+3/2с=2/2c+3/2c=(2+3)/2c=5/2c
5) d/ac+c/ad=d^2/acd+c^2/acd=(d^2+c^2)/acd
6)2а/3с+а/6с =4a/6c+a/6c=(4a+a)/6c=5a/6c