<p><strong>а)</strong></p>
<ul>
<li>42:7-8 = 6-8 = -2</li>
<li>60-5:10 = 60-0.5 = 59.5</li>
<li>630:9-3 = 70-3 = 67</li>
</ul>
<p><strong>б)</strong></p>
<ul>
<li>72:8-3 = 9-3 = 6</li>
<li>44:4-2 = 11-2 = 9</li>
<li>360:4:3 = 90:3 = 30</li>
</ul>
<p><strong>в)</strong></p>
<ul>
<li>12*3:9 = 36:9 = 4</li>
<li>46:2-3 = 23-3 = 20</li>
<li>280:4:7 = 70:7 = 10</li>
</ul>
<p><strong>г)</strong></p>
<ul>
<li>(37+11)*24 = 48*24 = 1152</li>
<li>(53-39)*6 = 14*6 = 84</li>
<li>49:(71-64) = 49:7 = 7</li>
</ul>