Помогите с матикой даю 20баллов надо решить примеры
1.(38-(-34)):(24-30)=
2.(75-83):(46-54)=
3.(-18-(-50)):(20-36)=
4.(-72-24):(18-22)=
5.(-7)•(-15):(-15+18)=
6.-5•(-26)+121:(-11)=
7.-12+16-35+20=
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