ГДЗ Алгебра 7 клас Бевз (2024)

Розв’яжіть рівняння: a) (x – 1)(x – 3) = x2; x2 – 3x – x + 3 = x2; –4x = –3; –4x = –3; x = 3/4; б) (y + 2)(y – 5) = y2; y2 – 5y + 2y – 10 = y2; –3y = 10; y = –10/3; y = –31/3; в) (2x + 1)(x – 5) = 2x2; 2x2 – 10x + x – 5 = 2x2; –9x = 5; x = –5/9; г) 3z2 = (1 – z)(1 – 3z); 3z2 = 1 – 3z – z + 3z2; 4z = 1; z = 1/4; z = 0,25.