Решите уравнения 3)3z+6/7=-z-2/5. Created by Angelinasuprun. matematika-ru

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Angelinasuprun @Angelinasuprun

July 2022 1 1 Report

Решите уравнения

3)3z+6/7=-z-2/5

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zhenyaM2002

Verified answer

Условие можно прочитать по-разному:
1 вариант.
3z + 6/7 = -z - 2/5
3z + z = - 2/5 - 6/7
4z = - (14 + 30)/35
4z = - 44/35
z= - 44/35 : 4 = - 44/35 * 1/4 = - (11*1)/(35*1)
z= - 11/35
проверим:
3 * (- 11/35) + 6/7 = - (- 11/35) - 2/5
- 33/35 + 6/7 = 11/35 - 2/5
(-33 + 30)/35 = (11 -14)/35
-3/35 = -3/35

2 вариант. Если (3z +6) и (-z-2) числители дробей.
(3z+6)/7 = (-z-2)/5
5(3z+6)= 7(-z-2)
15z +30 = -7z -14
15z+7z= -14-30
22z= -44
z= -44/22 = - 2/1
z= -2
проверим:
(3*(-2)+6)/7 = (-(-2)-2)/5
(-6+6)/7 = (2-2)/5
0=0

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Answer

Answers & Comments

Verified answer

perechislite kakie narody i gosudarstva smenyali drug druga v istorii britanskihed81e9b43c83895cc7c9e59a924a6c39 63949

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