⒐ ⒑
3.14×8×13＋3.14×（8÷2）²
3.14×3×2＋3.14×（3÷2）² ＝3.14×104＋3.14×1 6
＝18.84＋3.14×2.25 ＝3.14×（104＋1）
＝18.48＋7.065 ＝3.14×120
＝ 25.905.（平方米） ＝ 376.8（平方厘米）
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