加法算式：{#blank#}1{#/blank#}

乘法算式：{#blank#}2{#/blank#}

乘法口诀：{#blank#}3{#/blank#}

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 =

4×3=      66－45=      70－5=      23－（46－38）=

36+7=      25+65=      23+37=      21+19+34=

5×6=      90－45=      2×2=      6×6-28=

42-8=      6×4=      4×4=      40+（89-54）=

25+21=      5×3=      6×3=      70+2×6=

算式是：{#blank#}2{#/blank#}。