Question

94+84+74+...+24+14+4=(94+4)×5=490​

Answer 1

1. 94+84+74+24+14+4=294

2.490-294=196=64+54+44+34

94+84+74+64+54+44+34+24+14+4=(94+4)×5=490

Answer 2

Ответ:

Все четко и понятно

Пошаговое объяснение:

Неизвестное число обозначаем как икс. складываем 94+84+74=250 т.е. упрощаем. далее складываем 250+42=294 у нас получается уравнение, решаем его и неизвестное число=196. проверяем. 490=490

Надеюсь это правильно

Answer 3

It looks like you're trying to calculate the sum of a series of numbers by grouping them and then multiplying. The series you provided seems to be decreasing by 10 in each step. Let's break down the calculation to see if the result is correct:

Starting with 94 and decreasing by 10 in each step, we have: 94 + 84 + 74 + ... + 24 + 14 + 4

The last term is 4, and there are a total of 10 terms in the series.

Now, let's apply the formula for the sum of an arithmetic series: Sum = (n/2) * (first term + last term)

In this case, n = 10 (number of terms), first term = 94, and last term = 4.

Sum = (10/2) * (94 + 4) Sum = 5 * 98 Sum = 490

So, your calculation is indeed correct: 94 + 84 + 74 + ... + 24 + 14 + 4 = 490.