Помогите решить, пожалуйста:
1)16.5 : 2 3//4-57-1//19
2)5//2x=25//30
3)1//4(6x+1 1//3)+ 7 3//8x
4)(2 1//3+1 5//7)*1 3//5-0,25
*Где // - дробь.
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