3х²+7х-10=0
7х²+4х-11=0
6х²+5х-11=0

3х^2+7х-10=0D=49+120=169x1=-7+13/6=6/6=1x2=-7-13/6= -20/6=-10/37x^2+4x-11=0D=16+308=324x1=-4+18/14= 14/14=1x2= -4-18/14= -22/14=-11/76x^2+5x-11=0D=25+264=289 x1=-5+17/12=12/12=1x2=-5-17/12=-22/12=-11/6

3х*3х+7-10=09х+7=09х=0-79х=-7х=-7:9х=-0,(7)Ответ:х=-0,(7)7х*7х+4х-11=049х+4х-11=053х=0+1153х=11х=11:53х=020754717Ответ:х=0207547176х*6х+5х-11=036х+5х=0+1141х=11х=11:41х=026829268Ответ:х=026829268