6+6+6+6＝{#blank#}1{#/blank#}×{#blank#}2{#/blank#}    2+2+2+2+2+2+2+2+2＝{#blank#}3{#/blank#}×{#blank#}4{#/blank#}

想一想。

× =24      - =2

=({#blank#}1{#/blank#})      =（{#blank#}2{#/blank#})

{#blank#}1{#/blank#}

{#blank#}2{#/blank#}

2×3 =           4×6 =          5×4 =          4 ×2 =

4×3=           3×5=           5×3=           5×6=

5×2=           4×5=           3×6=           5×5=

4×9=           2×8=           4×7=           8×3=

8×5=           7×3=           9×3=           9×5=

9×8＝       5×5＝       80－6＝       58＋2＝

8＋47＝      72＋9＝        9×7＝        4×8＝

7×4＝      17－8＝        17＋5＝        6×5＝

43－30＝      82－9＝       12－3＝        5×9＝