Вправи

Вправи: 778 (1-2)

Готова відповідь до завдання 778 (1-2) з ГДЗ Алгебра 7 клас Тарасенкова 2024.

Алгебра, 7 клас · Вправи

Текстова відповідь

1) x3 = 2x+12| • 6; 2x = 3(2x + 1) ; 2x = 6x + 3; 2x – 6x = 3; –4x = 3; x = –34.

2) 5y-14 = 7y12| • 12; 3(5y – 1) = 7y; 15y – 3 = 7y; 15y – 7y = 3; 8y = 3; y = 38.

3) 1 + d8 = 1-2d16\| • 16; 16 + 2d = 1 – 2d; 2d + 2d = 1 – 16; 4d = –15; d = –154; d = –334.	4) 2-3x6 + 2 = x15\| • 30; 5(2 – 3x) + 60 = 2x; 10 – 15x + 60 = 2x; –15x – 2x = –60 – 10; –17x = –70; x = 7017; x = 4217.
5) 3 – y+19 = 2y-818\| • 18; 54 – 2(y + 1) = 2y – 8; 54 – 2y – 2 = 2y – 8; –2y – 2y = –8 – 54 + 2; –4y = –60; y = 15.	6) 8z-32 – 4 = 1-z7\| • 14; 7(8z – 3) – 56 = 2(1 – z) ; 56z – 21 – 56 = 2 – 2z; 56z + 2z = 2 + 21 + 56; 58z = 79; z = 7958; z = 12158.

3) 1 + d8 = 1-2d16\| • 16; 16 + 2d = 1 – 2d; 2d + 2d = 1 – 16; 4d = –15; d = –154; d = –334.	4) 2-3x6 + 2 = x15\| • 30; 5(2 – 3x) + 60 = 2x; 10 – 15x + 60 = 2x; –15x – 2x = –60 – 10; –17x = –70; x = 7017; x = 4217.
5) 3 – y+19 = 2y-818\| • 18; 54 – 2(y + 1) = 2y – 8; 54 – 2y – 2 = 2y – 8; –2y – 2y = –8 – 54 + 2; –4y = –60; y = 15.	6) 8z-32 – 4 = 1-z7\| • 14; 7(8z – 3) – 56 = 2(1 – z) ; 56z – 21 – 56 = 2 – 2z; 56z + 2z = 2 + 21 + 56; 58z = 79; z = 7958; z = 12158.