二年级口算题:两位数的加减法 (1)27 + 24 = (2)72 + 18 = (3)46 + 19 = (4)70 + 36 = (5)29 + 14 = (6)26 + 20 = (7)45 + 39 = (8)29 + 11 = (9)42 + 45 = (10)97 + 78 = (11)49 + 43 = (12)45 + 29 = (13)68 + 60 = (14)26 + 59 = (15)32 + 68 =