小学一年级口算题:运算练习(六) (1)()-10=2 (2)14-()=10 (3)17+()=18 (4)7+()=20 (5)()-5=3 (6)18-()=7 (7)()-10=4 (8)()-4=9 (9)1+()=11 (10)15-()=1 (11)3-()=1 (12)()+3=12 (13)()-11=5 (14)()-2=3 (15)18-()=3