คณิตศาสตร์

1.[(-7)-(-3)]+6                                                 11.[(-8)+10]+(-15)                
2.(-5)+[(-8)+2]                                                12.(-8)+[(-10)-15]
3.(3-9)+12                                                  13.[(-7)+(-14)]+21
4.(12-21)+(-15)                                                14.(2-10)+[(-8)-(-5)]
5.[(-8)-12]+20                                                  15.(2-10)-[(-8)-(-5)]
6.[(-37)+48]-9                                                  16.(4-5)-(6-7)
7.(5+7)-[(2-14)]                                                17.[4-(5-6)]-7
8.(14-5)+(5-14)                                                 18.4-(5-6)-7
9.(-4)-[(-6)-(-8)]                                                19.[(-82)+(-18)]-(18+82)
10.(1-7)-(2-9)                                                  20.1-{3-[(-4)-5]}
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