(х+у)³= x³+ y³+3xy*(x + y)
х³+3х²у+3ху²+у³= х³+у³+3х²у+3ху²
х³+3х²у+3ху²+у³–х³–у³–3х²у–3ху²=0
0=0
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(х+у)³= x³+ y³+3xy*(x + y)
х³+3х²у+3ху²+у³= х³+у³+3х²у+3ху²
х³+3х²у+3ху²+у³–х³–у³–3х²у–3ху²=0
0=0