Упростите упражнение

(1-3х)(1-4х+х²)+(3х-1)(1-5х+х²)+3х²

(1-3х)(1-4х+х²)+(3х-1)(1-5х+х²)+3х²==(1-3х)(1-4х+х²)-(1-3x)(1-5x+x²)+3x²==(1-3x)(1-4x+x²-1+5x-x²)+3x²==(1-3x)*x+3x²=x-3x²+3x²=x