решите кто-нибудь пожалуйста!. Created by 77010. matematika-ru

решите кто-нибудь пожалуйста!...

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|x| + 4 = 7
|x| = 7 - 4
|x| = 3
x = 3
x = - 3

2|x + 6| = 30
|x + 6| = 30 : 2
|x + 6| = 15
x + 6 = 15 x + 6 = - 15
x = 15 - 6 x = - 15 - 6
x = 9 x = - 21

|x| - 8 = 3
|x| = 3 + 8
|x| = 11
x = 11
x = - 11

|4x - 7| + 6 = 11
|4x - 7| = 11 - 6
|4x - 7| = 5
4х - 7 = 5 4х - 7 = - 5
4х = 5 + 7 4х = - 5 + 7
4х = 12 4х = 2
х = 12 : 4 х = 2 : 4
х = 3 х = 0,5

0 votes Thanks 1

akaganets 1) |x|+4=7
|x|=7-4
|x|=3
x=3; x= -3.
2) 2|x-6|=30
|x+6|=30\2
|x+6|=15
x+6=15. или x+6=-15
x=15-6. x= -15-6
x=9. x= -21

0 votes Thanks 1

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