Вопрос школьника по предмету Математика
Одно число больше другого в 1,5 раза, среднее арифметическое этих двух чисел равно 30. Найдите эти числа.
Ответ учителя по предмету Математика
одно число-х
другое число-1,5*х,от сюда уравнение
(х+1,5х)/2=30
2,5х/2=30
2,5х=60
х=24 одно число
24*1,5=36 другое число
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20 БАЛЛОВ
1) (0,5z-1)(2z+3)-0,1z=z²
2) z²-(z+1)(z-5)≤0
3) (t⁴-t⁴+1)(t⁴+t⁴+1)=t8+t⁴+1