一、计算。
(1)3×5= (2)6×5= (3)2×2= (4)5×2+3 =
(5)4×2= (6)4×8= (7)5×3= (8)3×3+2=
(1)3×5= (2)6×5= (3)2×2= (4)5×2+3 =
(5)4×2= (6)4×8= (7)5×3= (8)3×3+2=
(9)4×5+4= (10)4×5—5= (11)3×2= (12)1×4=
(13)4×4= (14)5×2+2= (15)3×4-2= (16)2×3=
(13)4×4= (14)5×2+2= (15)3×4-2= (16)2×3=