2х*3х+7х²-х*3+8хх-х*12х=6х²+7х²-3х+8х²-12х²=
=9х²-3х
2х³+3х²-2х-3 при х=-1
2*(-1)³+3*(-1)²-2*(-1)-3=2*(-1)+3*1+2-3=-2+3+2-3=0
4х²-х²у+5ху+(27ху-4х²у+3х²)=4х²-х²у+5ху+27ху-4х²у+3х²=7х²-5х²у+32ху
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2х*3х+7х²-х*3+8хх-х*12х=6х²+7х²-3х+8х²-12х²=
=9х²-3х
2х³+3х²-2х-3 при х=-1
2*(-1)³+3*(-1)²-2*(-1)-3=2*(-1)+3*1+2-3=-2+3+2-3=0
4х²-х²у+5ху+(27ху-4х²у+3х²)=4х²-х²у+5ху+27ху-4х²у+3х²=7х²-5х²у+32ху