Решите уравнение: а) 3(5х-4)-8х=4х+9 б) 19х-8(х-3)=66-3х - вопрос №592924935484919836630207500214 от ната1182 26.04.2020 03:09

Question

Математика: Решите уравнение: а) 3(5х-4)-8х=4х+9 б) 19х-8(х-3)=66-3х в)0,2(0,7х-5)+0,02=1,4(х-1,6) г) 2,7(0,1х+3,2)+0,6(1,3-х)=16,02

ната1182 · Answer

3(5х-4)-8х=4х+915х-12-8х=4х+915х-8х-4х=12+93х=21х=719х-8(х-3)=66-3х19х-8х-24=66-3х19х-8х+3х=66-2414х=42х=42:14х=30.2(0.7х-5)+0.02=1.4(х-1.6)0.14х-1+0.02=1.4х-2.240.14х-1.4х=1-0.02-2.24-1.26х=-1.26х=-1.26:-1.26х=12.7(0.1х+3.2)+0.6(1.3-х)=16.020.27х+8.64+0.78-0.6х=16.020.27х-0.6х=16.02-8.64-0.78-.33х=6.6х=6.6:3.3х=2...