Ответы на вопрос:
Х+ (х +4) = 22 х + х + 4 = 22 2х + 4 = 22 2х = 22 - 4 2х = 18 х = 18: 2 х = 9 9 + (9+4) = 22 9 + 13 = 22 22 = 22 (х-7) + х = 33 х - 7 + х = 33 2х - 7 = 33 2х = 33 + 7 2х = 40 х = 40: 2 х = 20 (20 - 7) + 20 = 33 13 + 20 = 33 33 = 33 х + (-1) = 40 х - 1= 40 х = 40 + 1 х = 41 41 + (-1) = 40 40 = 40
1) х²+5х=0
х(х+5)=0
х1=0
х+5=0
х2= -5
2) х²+5х+0=0
д=5²-4*1*0=25
х1=(-5+5)/2=0
х2=(-5-5)/2=-10: 2= -5
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