( )×( )=( )( )×( )=( )
50-24=
22+18=
2×4+5=
15+13=
2×2+30=
3×3=
4×5=
9+(14-4)=
□ × □ = □ (只)
口诀:
□×□=□
□÷□=□
4×7 27 5×5 5+25 63﹣25 15+15
6×5 30 8×4 3×9 78﹣26 78﹣25