Ache o resultado - você é bom em matemática?

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1.
10X5
2.
20%
3.
5X5
4.
12/2
5.
√144
6.
√25
7.
10,5+20,5+3,5-1,5
8.
11+8-8+3-7
9.
8,3-7,1+6,4+5-9
10.
50,4-60+10,8
11.
3,1415926535897932384626433832795-1
12.
PI / Numero de dicas no caça-palavras