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2×8= 6×3= 8×5= 3×9=
1×3= 2×3= 2×6= 5×2=
28+7= 32-8= 36+9= 40-8=
4×5= 4×9= 3×7= 9×5=
3×5= 8×1= 4×3= 7×4=
□○□○□=□(岁)
□○□=□(元)
□○□○□=□(元)
□○□○□=□(元)