口算．

7 18 ×12=	5×3 2 15 =	21× 3 14 =	2 27 ×3 3 8 =
14× 3 8 =	4 23 × 46 8 =	25 22 × 11 50 =	57× 2 38 =
3.6× 3 4 =	2.7× 5 18 =	17 19 × 38 51 =	8 1 7 ×0.875=
17 36 × 72 85 =	3.25× 4 13 =	11 12 × 36 121 =	10 10 - 9 9 =
3 4 - 0.75=	2 3 + 4 9 =	6- 8 11 =	4 5 - 2 3 =