Предмет: Математика, автор: аришка37

вычеслите выбрав удобный способ порядок действий: 42+61+28+39+30

Ответы

Автор ответа: DemoN4ик10

здесь везде знак "+"значит от перестоновки мест слагаемых сумма не меняется
1)42+28=70
2)61+39=100
3)70+100+30=200

Автор ответа: vavako73

(61+39)+(42+28)+30=200
100+(70+30)=200

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