Ответ:
1)1.8х-2х+0.4=-0.2х+0.4
-0.2*2+0.4=0
2)1.8-9х+3.5х=1.8-5.5х
1.8-5.5*2=-9.2
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Ответ:
1)1.8х-2х+0.4=-0.2х+0.4
-0.2*2+0.4=0
2)1.8-9х+3.5х=1.8-5.5х
1.8-5.5*2=-9.2