Question

Раскройте скобки: (2с+5^2

Раскройте скобки (4а-3с)^3

Answer 1

Объяснение:

$(2c + 5) {}^{2} = (2c) {}^{2} + 2 \times 2c \times 5 + 5 {}^{2} \\ = 4c { }^{2} + 20c + 25$

2)

$(4a - 3c) {}^{3} = (4a) {}^{3} - 3(4a) {}^{2} \times 3c \\ + 3 \times 4a \times (3c) {}^{2} - (3c) {}^{3} = 64a {}^{3} \\ - 3 \times 16a {}^{2} \times 3c + 3c + 3 \times 4a \times 9c {}^{2} - \\ 27c {}^{3} = \\ 64a {}^{3} - 144a {}^{2} c + 108ac {}^{2} - 27c {}^{3}$