口算．
6×7= 9×9= 3×6= 2×6=
8×3+4= 36+4= 8×7= 2×2=
9+57= 3×4+9= 5×6= 18+60=
9×3= 5×5= 38﹣18+25= 41﹣2=
6×9= 8×5= 7×2= 7×5﹣3=
口算．
6×7= 9×9= 3×6= 2×6=
8×3+4= 36+4= 8×7= 2×2=
9+57= 3×4+9= 5×6= 18+60=
9×3= 5×5= 38﹣18+25= 41﹣2=
6×9= 8×5= 7×2= 7×5﹣3=
粤公网安备 44130202000953号