Estimate the sum of fractions and write <,>, or = comparing with 1.
1. 17/34+68/136 ()1
2. 37/74+2/3 ()1
1. 17/34 + 68/136 = 1/2 + 1/2 = 1. Therefore, 17/34 + 68/136 = 1 ( = ).
2. 37/74 + 2/3 = 1/2 + 2/3 = 5/6. Since 5/6 is less than 1, 37/74 + 2/3 < 1 ( < ).