^You don*t look very well.Are you OK? ^No.I*ve got a stomachache ^Oh dear.How long have had that? ^It started last night.I ate a big Chinese meal. ^So take some medicine and go to bed. ^Good idea!
^You don*t look very well.Are you OK? ^No.I*ve got a stomachache ^Oh dear.How long have had that? ^It started last night.I ate a big Chinese meal. ^So take some medicine and go to bed. ^Good idea!
а(а-27)+72=0
а^2-27а+72=0
Д=729-4*72=729-288=441
а1=(27+21)/2=24
а2=(27-21)/2=3
х^2-2х=24. х^2-2х=3
х^2-2х-24=0. х^2-2х-3=0
Д=4+4*24=100. Д=4+4*3=16
х1=(2+10)/2=6. х3=(2+4)/2=3
х2=(2-10)/2=-4. х4=(2-4)/2=-1