Назад
ГДЗ Математика 7 клас Істер (2024)
Тема 5. МНОГОЧЛЕН
Спростіть вираз:
1) (5x – 1)(4х + 7) – 4x(5x – 8) = 20x2 + 35x – 4x – 7 – 20x2 + 32x = 63x – 7;
2) (а + 3)(а – 2) – а(а + 9) + 6 = а2 – 2а + 3а – 6 – а2 – 9а = –8а – 6;
3) 2x(3x – 1) + (х – 9)(5x – 6) = 6х2 – 2x + 5x2 – 6x – 45x + 54 = 11x2 – 53x + 54;
4) (2х + 3)(5х – 4) – 2x(x – 3) – 13(х – 1) = 10x2 – 8x + 15x – 12 – 2x2 + 6х – 13x + 13 = 8x2 + 1.
1) (5x – 1)(4х + 7) – 4x(5x – 8) = 20x2 + 35x – 4x – 7 – 20x2 + 32x = 63x – 7;
2) (а + 3)(а – 2) – а(а + 9) + 6 = а2 – 2а + 3а – 6 – а2 – 9а = –8а – 6;
3) 2x(3x – 1) + (х – 9)(5x – 6) = 6х2 – 2x + 5x2 – 6x – 45x + 54 = 11x2 – 53x + 54;
4) (2х + 3)(5х – 4) – 2x(x – 3) – 13(х – 1) = 10x2 – 8x + 15x – 12 – 2x2 + 6х – 13x + 13 = 8x2 + 1.