Предмет: Математика, автор: sulya78

1)найди значения буквенных выражений : (а+150) -340 а =710 2) РЕШИ УРАВНЕНИЯ 813 -Х=620 Х+17=545-35 3)В театре ученики 3 класса заняли в партере 3 ряда по 7 мести ещё 18 мест в амфитеатре ,сколько всего мест заняли ученики № класса ? НАДО СРОЧНО !!! ПОМОГИТЕ!!!!

Ответы

Автор ответа: НаталиИва
0
(а+150)-340=а+150-340=а-190=710-190=520

813-х=620
-х=620-813
-х=-193
умножаем обе части на (-1)
х=193

х+17=545-35
х=545-35-17
х=493

Задача:
3*7=21 место заняли ученики в партере
21+18=39 мест заняли всего
Ответ: ученики 3 класса заняли в театре 39 мест
Автор ответа: sulya78
0
СПАСИБО
Автор ответа: НаталиИва
0
не за что!
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