Назад
ГДЗ Алгебра 7 клас Тарасенкова (2024)
Роздiл 3. Одночлени i многочлени
Спростіть вираз:
1) (а – 1)(а2 + a + 1) – (a + 1)(a2 – a + 1) = a3 + a2 + a – a2 – a – 1 – a3 + a2 – a – a2 + a – 1 = –2;
2) (1/2b – 2a2)(0,25b2 + 2a4 + a2b) = 0,125b3 + a4b + 0,5a2b2 – 0,5a2b2 – 4a6 – 2a4b = 0,125b3 – a4b – 4a6;
3) (x – y)(x + y) + (y + x)(–x – y) = x2 + xy – xy – y2 – xy – y2 – x2 – xy = –2y2 – 2xy.
1) (а – 1)(а2 + a + 1) – (a + 1)(a2 – a + 1) = a3 + a2 + a – a2 – a – 1 – a3 + a2 – a – a2 + a – 1 = –2;
2) (1/2b – 2a2)(0,25b2 + 2a4 + a2b) = 0,125b3 + a4b + 0,5a2b2 – 0,5a2b2 – 4a6 – 2a4b = 0,125b3 – a4b – 4a6;
3) (x – y)(x + y) + (y + x)(–x – y) = x2 + xy – xy – y2 – xy – y2 – x2 – xy = –2y2 – 2xy.