I can only say that there are many answers. With the conventional method, it is impossible to add three odd numbers to get an even number, so the idea must be extended to other mathematical symbols. Many of the following schemes can be extended and combined, and the principle is to create even numbers or zeros.

Option 1: 3! + 1 1+ 13=30 (3! =6)

Option 2: Log3 (9)+3? + 1=30 ( Log3 (9)=2，)

Option 3: 5.5+9.5+ 15=30?

Scheme 4:1'+15+15 = 30 (the reciprocal of any constant is 0).

Option 5: 3? +3+ 1'=30 (3? =27 1'=0)

Option 6: 3? +9-3! =30 (use negative numbers)

Scheme 7:11+13+(6) = 30 (reversing 9 to 6 is opportunistic).

Scheme 8: 1 (days)+1 (hours) +5 (hours) =30 (hours)

Scheme 9: 15+15+1= 30 (decimal 30 means decimal 33,15 means decimal 16).

Author: Gao Jian

Link:/question/29720309/answer/50393840

Source: Zhihu.

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