Question

389+(х-47)=819
900÷а=180÷4
(х+631)567=666
47*х=611
решить уравнение

Answer 1

x-47=819-389
x-47=430
x=447

900/a=45
a=900/45=20

x+631=666/567
x=666/567-631 = 1 99/567 - 630 567/567 = -629  468/567

x=611/47=13