二年级口算题:9以内的乘法口诀 (1)5 × 1 = (2)1 × 6 = (3)7 × 1 = (4)5 × 8 = (5)5 × 1 = (6)5 × 8 = (7)3 × 9 = (8)4 × 4 = (9)3 × 4 = (10)4 × 9 = (11)5 × 8 = (12)5 × 7 = (13)6 × 9 = (14)6 × 2 = (15)9 × 7 =