1) (2a-4b)^3 2) (x-7)^3 3) (2x-9)^3 4) (2x-7y^2)^3 - вопрос №7251328124327332934272353243362 от alexasnowbell 09.04.2020 11:50

Question

Алгебра: 1) (2a-4b)^3 2) (x-7)^3 3) (2x-9)^3 4) (2x-7y^2)^3 5) (3x^2-4x^3)^3 6) (2,5x-3,2y^2)^3

alexasnowbell · Answer

1) (2a-4b)³=8a³-48a²b+96ab²-(4b)³=8a³-48a²b+96ab²-64b³.
2) (x-7)=x³-21x²+147x-7³=x³-21x²+147x-343.
3) (2x-9)³=8x³-108x²+486x-9³=8x³-108x²+486x-729.
4) (2x-7y²)³=8x³-84x²y+294xy⁴-(7y²)³=8x³-84x²y²+294xy⁴-343y⁶.
5) (3x²-4x³)³=27x⁶-108x⁷+144x⁸-(4x³)³=27x⁶-108x⁷+144x⁸-64x⁹.
6) (2,5x-3,2y²)³=2,5x³·x³-9,6·2,5²·x²y²++7,5·3,2²·xy⁴-(3,2y²)³=15,625x³-60x²y²+76,8xy⁴-32,768y⁶.