（6409+23×17）÷68．

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Worked solution

1. 先计算小括号内的乘法

根据四则混合运算的顺序，先算小括号里面的乘法：
$23 \times 17 = 391$
此时算式变为： $(6409 + 391) \div 68$

2. 计算小括号内的加法

接着计算小括号里面的加法：
$6409 + 391 = 6800$
此时算式变为： $6800 \div 68$

3. 计算小括号外的除法

最后计算括号外的除法：
$6800 \div 68 = 100$

Answer

100

AI analysis — may contain mistakes.

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