A:①②④
B:②③④
C:①③④
D:①②③
2×9=____ 9×5=____3×6=____ 2×6=____
1×1=____ 5×7=____ 2×2=____3×2=____
5+6=____ 3×4=____ 9×3=____ 5×5=____
7×4=____ 6+3=____ 6×5=____ 7×2=____