Предмет: Математика, автор: Никогда4567890

Как решить уравнение (x - 1) : 3 = (20 - 2x) : 3

Ответы

Автор ответа: MrLyanda
2
умножим на 3 обе части
x-1=20-2x
3x=21
x=21:3
x=7
Автор ответа: elinaelina2013
1


(X-1):3=(20-2x):3

3x-3=60-6x

3x+6x=60+3

9x=63

x=63:9

x=7


MrLyanda: скобки раскрыты не правильно
elinaelina2013: Тогда не знаю .
MrLyanda: там знак разделить а ты умножила
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