1.4х²-12х+х-3+12=4х²-11х+9 (это если (4х+1)(х-3)+12 не равно 0)2.х²-3х+2х-6-2х²-11х+40=х²-5хх²-3х+2х-6-2х²-11х+40-х²+5х=02х²+7х-34=0Д=49+8*34=√321х1=-7+√321/4х2=-7-√321/43.36х²-60х+25+18х²-8-36=054х²-60х-19=0Д=3600+4*54*19=7704=6√214х1=60-6√214/108х2=60+6√214/108