решите пожалуйста рациональным способом 

 

4. 1//9 *5//8+3. 5//9*5//8+1.1//3*5//8

 

найдите значение выражения 

 

(1.1//7-23//49) / 22//147-(0,6 / 3. 3//4)*2.1//2 

 

//-дробь 

 

/- это делить 

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