1. 计算

2×3 =           4×6 =          5×4 =          4 ×2 =

4×3=           3×5=           5×3=           5×6=

5×2=           4×5=           3×6=           5×5=

4×9=           2×8=           4×7=           8×3=

8×5=           7×3=           9×3=           9×5=