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oikawa1
@oikawa1
July 2022
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-х+3 (-7+5х)>7х+7
2(8+х)-10х=4
Помогите пожалуйста решить неравенства
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zhenyaM2002
Verified answer
Неравенство:
- x + 3(-7 + 5x) > 7x + 7
- x - 21 + 15x > 7x + 7
14x - 21 > 7x + 7
14x - 7x > 7 + 21
7x > 28
x > 4
Ответ : x∈ ( 4 ; + ∞)
Уравнение:
2(8 + х ) - 10х = 4
16 + 2х - 10х = 4
16 - 8х = 4
- 8х = 4 - 16
- 8х = -12 |÷ (- 4)
2x = 3
x = 3 : 2
х = 1,5
проверим:
2( 8 + 1,5) - 10*1,5 =4
2 *9,5 - 15 = 4
19 - 15 = 4
4=4
Ответ : х = 1,5.
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Answers & Comments
Verified answer
Неравенство:- x + 3(-7 + 5x) > 7x + 7
- x - 21 + 15x > 7x + 7
14x - 21 > 7x + 7
14x - 7x > 7 + 21
7x > 28
x > 4
Ответ : x∈ ( 4 ; + ∞)
Уравнение:
2(8 + х ) - 10х = 4
16 + 2х - 10х = 4
16 - 8х = 4
- 8х = 4 - 16
- 8х = -12 |÷ (- 4)
2x = 3
x = 3 : 2
х = 1,5
проверим:
2( 8 + 1,5) - 10*1,5 =4
2 *9,5 - 15 = 4
19 - 15 = 4
4=4
Ответ : х = 1,5.