二年级口算题:9的乘法 9 × 4= 9 × 9= 9 × 9= 5 × 9= 9 × 4= 4 × 9= 9 × 4= 8 × 9= 9 × 2= 6 × 9= 9 × 5= 3 × 9= 9 × 7= 9 × 9= 9 × 9= 2 × 9= 9 × 1= 7 × 9= 9 × 2= 8 × 9=