Вопрос школьника по предмету Математика
Два мальчика купили 10 ручек по одинаковой цене. Один мальчик заплатил 30 руб, а второй 20 руб. По сколько ручек купили каждый мальчик?
Ответ учителя по предмету Математика
30+20=50 руб стоят 10 ручек
50:10=5 руб стоит ручка
30:5=6 ручек
20:5= 4 ручки
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1) 9х+36=0
2)10х-12=3х+9
3)-4(5х+1)=5(4-3х)
4)4(0,6х-0,3)-3(0,7-0,1)=0
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