Ответ:
Пошаговое объяснение:
1)
х + 4/21 = 2/3 + 2/7
х + 4/21 = 14/21 + 6/21
х + 4/21 = 20/21
х = 20/21 - 4/21
х = 16/21
2)
(4/5 - х) + 13/20 = 7/10
4/5 - х = 7/10 - 13/20
16/20 - х = 14/20 - 13/20
16/20 - х = 1/20
х = 16/20 - 1/20
х = 15/20
х = 3/4
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Ответ:
Пошаговое объяснение:
1)
х + 4/21 = 2/3 + 2/7
х + 4/21 = 14/21 + 6/21
х + 4/21 = 20/21
х = 20/21 - 4/21
х = 16/21
2)
(4/5 - х) + 13/20 = 7/10
4/5 - х = 7/10 - 13/20
16/20 - х = 14/20 - 13/20
16/20 - х = 1/20
х = 16/20 - 1/20
х = 15/20
х = 3/4
Ответ:
1)
2)