Ответы на вопрос:
11/18-14/27x=5/1211/18-14/27х=5/1214/27х=11/18-5/12=(66-45)/108=21/108=7/3614/27х=7/36х=7/36: 14/27=7/36*27/14=3/8х=3/81/3x+1/4x+1/5x=1 19/75 1/3+1/4+1/5=(20+15+12)/60=47/60 47/60х=1 19/75=94/75 х=94/75: 47/60=94/75*60/47=12/15=4/5 х=4/5
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