Question

решите уравнения.
20×а-432=568;
963-х+579=900.​

Answer 1

$1)20*a-432=568\\20a=568+432\\20a=1000\\a=50\\2)963-x+579=900\\1542-x=900\\-x=900-1542\\x-=-642\\x=642$

Answer 2

Решение:

1) $20 \times a - 432 = 568$

$20 \times a = 568 + 432$

$20 \times a = 1000$

$a = 1000 \div 20$

$a = 50$

__________________________

$20 \times 50 - 432 = 568$

$568 = 568$

_____

2)$963 - x + 579 = 900$

$963 - x = 900 - 579$

$963 - x = 321$

$x = 642$

__________________________

$963 - 642 + 579 = 900$

$900 = 900$