Ответы и объяснения

2014-03-03T11:52:44+00:00
8х-540=180.8х=180+540.8х=720.х=90
150-630:х=30.150-60=630:х.90=630:х.х=630/90.х=7
(260-х):6=30.260-х=30*6.260-х=180.260-180=х.х=80
(х:7)*50-75=175.(х:7)*50=250.х:7=5.х=35.
360:(8х+7х)=6.15х=360:6.15х=60.х=4