第32题：简便运算
用简便方法计算下式的结果
43−(27+3)=A43-(27+3)=A43−(27+3)=A
69+(16+5)=B69+(16+5)=B69+(16+5)=B
(19+8)+13=C(19+8)+13=C(19+8)+13=C
法则11：分配律，a ⋅\cdot ⋅ (b+c) =a ⋅ \cdot ⋅ b + a ⋅ \cdot ⋅ c .
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