1)19-2(3х+8)=2х-37 2)8х+3(7-2х)=4х+3 3)23-4(3х+8)=1-17х - вопрос №11923823728372433234381173285330 от Sergovseznaet 20.12.2021 01:07

Question

Математика: 1)19-2(3х+8)=2х-37 2)8х+3(7-2х)=4х+3 3)23-4(3х+8)=1-17х

Sergovseznaet · Answer

1)19 - 2 * (3х + 8) = 2х - 3719 - 6х - 16 = 2х - 373 - 6 х = 2х - 373 + 37 = 2х + 6х40 = 8х8х = 40х = 40 : 8х = 5проверка:19 - 2 * (3 * 5 + 8) = 2 * 5 - 3719 - 30 - 16 = 10 - 37-27 = -272)8х + 3 * (7 - 2х) = 4х + 38х + 21 - 6х = 4х + 321 - 3 = 4х + 6х - 8х18 = 2х2х = 18х = 18 : 2х = 9проверка:8 * 9 + 3 * (7 - 2 * 9) = 4 * 9 + 372 + 21 - 54 = 36 + 339 = 393)23 - 4 * (3х + 8) = 1 - 17х23 - 12х - 32 = 1 - 17х-12х + 17х = 1 + 32 - 235х = 10х = 10 : 5х = 2проверка: 23 - 4 * (3 * 2 + 8) = 1 - 17 * 223...