口算:
(1)1×8= (2)8×8=
(3)3×8= (4)8×2=
(1)8×4= (2)6×8=
(3)8×7= (4)5×8=
算一算.
7×2= 7×4= 3×7=
6×6-8=
2×6+15=
6×4+21=
6×1-6=
6×5-10=
3×6+6=