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ГДЗ Алгебра 7 клас Істер (2024)
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Виконайте дії:
1) (а + 2)(а2 – 2а + 4) – a(а2 – 5) = а3 + 8 – а3 + 5а = 5а + 8;
2) (b – 3)(b2 + 3b + 9 ) – b(b – 3)(b + 3) = b3 – 27 – b(b2 – 9) = b3 – 27 – b3 + 9b = 9b – 27;
3) (х + 4 ) (x2 – 4х + 16) – (х – 1)(x2 + x – 1) = х3 + 64 – х3 + 1= 65;
4) (2b2 – 1)(4b4 + 2b2 + 1) – (2b3 + 1)2 = (2b2)3 – 1 – (4b6 + 4b3 + 1) = 8b6 – 1 – 4b6 – 4b3 – 1 = 4b6 – 4b3 – 2.
1) (а + 2)(а2 – 2а + 4) – a(а2 – 5) = а3 + 8 – а3 + 5а = 5а + 8;
2) (b – 3)(b2 + 3b + 9 ) – b(b – 3)(b + 3) = b3 – 27 – b(b2 – 9) = b3 – 27 – b3 + 9b = 9b – 27;
3) (х + 4 ) (x2 – 4х + 16) – (х – 1)(x2 + x – 1) = х3 + 64 – х3 + 1= 65;
4) (2b2 – 1)(4b4 + 2b2 + 1) – (2b3 + 1)2 = (2b2)3 – 1 – (4b6 + 4b3 + 1) = 8b6 – 1 – 4b6 – 4b3 – 1 = 4b6 – 4b3 – 2.