( a, b ) = 13 a+ b = 65 a = ? b) = ? ( a, b ) = 10 a+b = 70 a= ? b= ? ( a, b ) = 5 a• b = 125 a= ? b = ? ( a, b ) = 7 a, b = 147 a= ? b= ? ( a , b ) = 4 a + b = 65 ( a , b ) = 4 a-b = 80 a= ? b = ? ( a , b) = 12 a-b = 864 a= ? b=? ( a, b ) = 6 a • b = 80 a= ? b= ? ​