Вопрос школьника по предмету Математика
Брат в 2 раза старше сестры,а в месте им 21 год. Сколько лет брату и сестре
Ответ учителя по предмету Математика
1) 21-1=20(лет) без 1 года
2) 20÷2-1=9(лет) сестре
3)20÷2+1=11(лет) брату
Брат в 2 раза старше сестры,а в месте им 21 год. Сколько лет брату и сестре
1) 21-1=20(лет) без 1 года
2) 20÷2-1=9(лет) сестре
3)20÷2+1=11(лет) брату
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2.Место истока?
3.Куда впадает?
4.Направление течения?
5.Особенности строения речной долины?
6.Основные притоки?
7.Режим питания?
8.Хозяйственное значение?