+ + =×=
上图中的双阴影部分用算式表示: × = , × =
× × 27× 27÷ ÷ ×
20× 20÷ 5÷ 5÷ 8÷ ÷8
×16= + = 12÷ = × ×9=
- = × = ÷ = 10÷ × =
24× = + = ÷ = 4× ÷4× =