1) <span>0.711-0.311= 0.4</span>
<span>2)3.44/0.4=8.6</span>
<span>3)8.6+2=10.6</span>
<span>4)10.6х=190.8</span>
<span> х=190.8/10.6</span>
<span> х=18</span>