умножаем все
1) х²-2х+4х-8-(х²-4х+8х-32)
х²-х²+2х-4х-8+32=24-2х=24-2×(-3.5)=24+7=31
2) 2х²-2х-3х+3+3х²+х+9х+3=5х²+5х+6=5(9/25)+5×(-3/5)+6=9/5-3+6= 1.8+3=4.8
умножаем все
1) х²-2х+4х-8-(х²-4х+8х-32)
х²-х²+2х-4х-8+32=24-2х=24-2×(-3.5)=24+7=31
2) 2х²-2х-3х+3+3х²+х+9х+3=5х²+5х+6=5(9/25)+5×(-3/5)+6=9/5-3+6= 1.8+3=4.8