(4x²y-5xy+9)×(12xy-3y+6x³)
(4x²y-5xy+9)×(12xy-3y+6x³)=48х³у²-12х²у²+24х⁵у-60х²у²+15ху²-30х⁴у+108ху-27у+54х³=48х³у+48х²у²+24х⁵у+15ху²-30х⁴у+108ху-27у+54х³