,плиз 4 номер!!!!!!!!!

Question

,плиз 4 номер!!!!!!!!!

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Answer 1

Х+1/9х=1 7/18; 1 1/9х=1 7/18; х=25/18:10/9; х=25/18*9/10; х=25/20; х=5/4; Х=1 1/4