Предмет: Математика, автор: kity20061

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Автор ответа: Алавит
1
4) ответ В, потому что в кубе 6 граней, из них 4 боковых
\frac{60}{6} \times 4 = 40

3) 10х+у = 10у+х-9
9х = 9у -9
х = у - 1
х + 1 = у
если х = 6, то у = 7, то их сумма 13, а произведение 13*9 = 117
ответ С
kity20061: A 13?
kity20061: То есть 2 задание?
kity20061: Сможешь?
Алавит: сейчас сейчас
Автор ответа: parus77
1
у куба 6 одинаковых граней.,тогда 60:6=10 г на одну грань.Всего боковых граней 4,поэтому надо 4*10=40 г .Потребуется 40 г,отв. В)
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