<table>
<tr><td>a) 27 + 36 = 63</td></tr>
<tr><td>63 : 7 = 9</td></tr>
<tr><td>9 + 51 = 60</td></tr>
<tr><td>60 : 30 = <strong>2</strong></td></tr>
<tr><td></td></tr>
<tr><td>б) 25.11 : 25 = 1.0044</td></tr>
<tr><td>1.0044 - 36 = -34.9956</td></tr>
<tr><td>-34.9956 : 8 = <strong>-4.37445</strong></td></tr>
<tr><td></td></tr>
<tr><td>в) 125.2 + 17 = 142.2</td></tr>
<tr><td>142.2 - 15 = 127.2</td></tr>
<tr><td>127.2 : 9 = <strong>14.13333333</strong></td></tr>
</table>