1) (4-3х)(4+х²)=4·4+4х²-3х·4-3х·х²=16+4х²-12х-3х³.
2) (3ху+у²)(х²+3ху)=3х³у+9х²у²+х²у²+3ху³=3х³у+10х²у²+3ху³.
3) (х³+4х)(2-х-4х)=(х³+4х)(2-5х)=2х³-5х⁴+8х-20х².
<span>(3х-2у)(2у+3х)=<span>(3х-2у)(3x+2y)=<span>(3х)^2-(2у)^2=9x^2-4y^2</span></span></span>