Упростите выражение:
(2x+y)^3-6xy(2x+y)
(2x+y)³-6xy(2x+y)=(2х)³+3·(2х)²у+3·2ху²+у³-12х²у-6ху²=
=8х³+12х²у+6ху²+у³-12х²у-6ху²= 8х³+у³
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(2x+y)³-6xy(2x+y)=(2х)³+3·(2х)²у+3·2ху²+у³-12х²у-6ху²=
=8х³+12х²у+6ху²+у³-12х²у-6ху²= 8х³+у³