(75³-35³) / 40 +75*35=
=(75-35)(75²+75*35+35²) / 40 + 75*35=
=40*(75²+75*35+35²) / 40 + 75*35=
=75² + 75*35 +35² +75*35 =
=75²+2*75*35 + 35²=
=(75+35)²=
=110²= 12100
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(75³-35³) / 40 +75*35=
=(75-35)(75²+75*35+35²) / 40 + 75*35=
=40*(75²+75*35+35²) / 40 + 75*35=
=75² + 75*35 +35² +75*35 =
=75²+2*75*35 + 35²=
=(75+35)²=
=110²= 12100