90÷10={#blank#}3{#/blank#}，因为{#blank#}4{#/blank#}×10=90

2×5 =      4 × 6 =       5 ×3 =       8 ×5 = 

5 +5 =       5×5 =        3 × 5=       2 ×9 =

7×4 =      3×6 =         6×5 =        4 ×1=

4× 8 =     7 ×3 =       4 × 4 =       4 + 4 =

36+2＝     5×3＝       4×4＝        1×6＝

4×5＝     56+34＝      100-58＝      47-28＝

56-28＝    80-54＝      2×7＝        3×6＝

5×5＝        2×6-6＝          46-37+24＝

18＋20{#blank#}1{#/blank#}35          75－32{#blank#}2{#/blank#}50             200厘米{#blank#}3{#/blank#}2米

60{#blank#}4{#/blank#}19＋43           25{#blank#}5{#/blank#}4×5                 5×3{#blank#}6{#/blank#}5＋5＋5