..............................................................................
<span>13*4,217+0,013-13*1,218
=</span>13*4,217+13*0,001-13*1,218=13(
<span>4,217+0,001-1,218)=
13</span>(
<span>4,218-1,218)=13*3=39</span>
<span> </span><em><span>∫ 8x</span><span>³dx</span></em> =2x⁴+c