Много баллов за правильное решение!

Х1 = а ; х2 = b ; x3 = c a + 2b + 3c = 4 2a + 6b + 4c = - 6 3a + 10b + 8c = - 8 ======= - 3a - 10b - 8c = 8 a + 2a - 3a + 2b + 6b - 10b + 3c + 4c - 8c = 4 - 6 + 8 ======= - 2b - c = 6 2b = - c - 6 a + 2b + 3c = 4 2b = 4 - a - 3c - c - 6 = 4 - a - 3c - 10 = - 2c - a a = 10 - 2c ======== 2a + 6b + 4c = - 6 2( 10 - 2c ) + 3( - c - 6 ) + 4c = - 6 20 - 4c - 3c - 18 + 4c = - 6 - 3c = - 6 - 2 c = 8/3 = 2 2/3 2b = - 2 2/3 - 6 = - 8 2/3 b = - 26/3 : 2 = - 26/6 = - 4 2/6 = - 4 1/3 a = 10 - 2•8/3 = 10 - 16/3 = 10 - 5 1/3 = 4 2/3 ===== X1 = 4 2/3 X2 = - 4 1/3 X3 = 2 2/3 ======== Проверка 4 2/3 + 2•( - 13/3 ) + 3•( 8/3 ) = 4 4 2/3 - ( 26/3 ) + 8 = 4 4 2/3 - 8 ( 2/3 ) + 8 = 4 4 2/3 - ( 2/3 ) = 4 4 = 4