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mamutovaferide2002
@mamutovaferide2002
July 2022
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Решите пожалуйста 14,15,16
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mz05
(х + 10)² = (5 - х )²
можно извлечь корень квадратный:
х +10 = 5 - х
х + х = 5 - 10
2х = - 5
х = - 5/2
х = -2,5
можно раскрыть скобки :
х² + 20х + 100 = 25 - 10х + х²
х² + 20х + 10х - х² = 25 - 100
30х = - 75
х = - 75/30
х = - 2,5
№15.
(х - 6) / 2 - х/3 = 3 |*6
3(x - 6) - 2x = 3*6
3x - 18 - 2x = 18
x - 18 = 18
x= 18+18
x= 36
-------------------------------
(36-6)/2 - 36/3 = 3
15 - 12 =3
3=3
№16.
13 + х/4 = х +1 | * 4
52 + x = (x+1) *4
52 + x = 4x +4
x - 4x = 4 -52
-3x = - 48
x= (-48) / (-3)
x= 16
---------------------------------------
13 + 16/4 = 16 +1
13 + 4 = 17
17 = 17
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Answers & Comments
можно извлечь корень квадратный:
х +10 = 5 - х
х + х = 5 - 10
2х = - 5
х = - 5/2
х = -2,5
можно раскрыть скобки :
х² + 20х + 100 = 25 - 10х + х²
х² + 20х + 10х - х² = 25 - 100
30х = - 75
х = - 75/30
х = - 2,5
№15.
(х - 6) / 2 - х/3 = 3 |*6
3(x - 6) - 2x = 3*6
3x - 18 - 2x = 18
x - 18 = 18
x= 18+18
x= 36
-------------------------------
(36-6)/2 - 36/3 = 3
15 - 12 =3
3=3
№16.
13 + х/4 = х +1 | * 4
52 + x = (x+1) *4
52 + x = 4x +4
x - 4x = 4 -52
-3x = - 48
x= (-48) / (-3)
x= 16
---------------------------------------
13 + 16/4 = 16 +1
13 + 4 = 17
17 = 17