Question

Решите уравнение 11/4=(640+x)/640 ​

Answer 1

$frac{11}{4} =frac{640+x}{640}|*640\\160*11=640+x\1760=640+x\x=1760-640=1120\\Otvet: 1120$

Answer 2

11/4=(640+x)/640

11*640/4=640+x

Сокращаем 640 и 4:

11*160=640+x

1760=640+x

1760-640=x

x=1120