х²-2х-4х+8-(х²-3х-х+3)=х²-6х+8-х²+4х-3= -2х+5
-2*1 3/4+5= -2*7/4+5=5-3,5=1,5
а²-а-5а+5-(а²+3а+2а+6)=а²-6а+5-а²-5а-6= -11а-1
-11*2 3/5-1= -11*13/5-1= -143/5-1= -28 3/5-1= -29 3/5
х²-2х-4х+8-(х²-3х-х+3)=х²-6х+8-х²+4х-3= -2х+5
-2*1 3/4+5= -2*7/4+5=5-3,5=1,5
а²-а-5а+5-(а²+3а+2а+6)=а²-6а+5-а²-5а-6= -11а-1
-11*2 3/5-1= -11*13/5-1= -143/5-1= -28 3/5-1= -29 3/5