Ответ:
(3.9-х):4=0.7
3.9-х=0.7*4
3.9-х=2.8
Х=3.9-2.8
Х=1.1
6*(х+1.5)=25.2
Х+1.5=25.2:6
Х+1.5=4.2
Х=4.2-1.5
Х=2.7
26.2-5х=17.4
5х=26.2-17.4
5х=8.8
Х=8.8:5
Х=1.76
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Ответ:
(3.9-х):4=0.7
3.9-х=0.7*4
3.9-х=2.8
Х=3.9-2.8
Х=1.1
6*(х+1.5)=25.2
Х+1.5=25.2:6
Х+1.5=4.2
Х=4.2-1.5
Х=2.7
26.2-5х=17.4
5х=26.2-17.4
5х=8.8
Х=8.8:5
Х=1.76