Яна38516 !!!!!!!!!!!!!!!!!!!!???

m11m

Verified answer

1)7х²-147х=0
7х*(х-21)=0
7х=0
х=0
или
х-21=0
х=21
21-0=21
2)2 или 1
3)3х²+22х+24=0
х(1,2)=-3±√22²-4*3*24/2*3=-3±14/6
х(1)=-3+14/6=11/6=1 5/6
х(2)=-3-14/6=-17/6=-2 5/6