Втеатре ученики первого класса заняли в партере 2 ряда по 9 мест и еще 13 мест в амфитеатре! сколько всего мест заняли ученики первого кдасса? ? сделать краткую запись

2*9 равно 18+13= 31 место

В партере - 2р.  по 9 м.
В амфитеатре - 13 м.
1) 9*2=18.
2)18+13=31.
ответ: 31 место.

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В 5 литровый бидон                          в 3 литровую банку
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