4)

[tex]( \frac{3}{4} x - 0.5y) {}^{2} = (0.75x - 0.5y) {}^{2} = \\ = (0.75x) {}^{2} - 2 \times 0.75 x\times 0.5y + (0.5y) {}^{2} = \\ = 0.5625 {x}^{2} - 0.75xy + 0.25 {y}^{2} [/tex]

5)

[tex](1 \frac{2}{3} c + 0.6) {}^{2} = ( \frac{5}{3} c) {}^{2} + 2 \times \frac{5}{3} c \times \frac{3}{5} + 0.6 {}^{2} = \\ = \frac{25}{9} {c}^{2} + 2c + 0.36 = 2 \frac{7}{9} {c}^{2} + 2c + 0.36[/tex]

6)

[tex]( \frac{5}{6} p - \frac{3}{5} q) {}^{2} = ( \frac{5}{6} p) {}^{2} - 2 \times \frac{5}{6} p \times \frac{3}{5} q + ( \frac{3}{5} q) {}^{2} = \\ = \frac{25}{36} {p}^{2} - pq + \frac{9}{25} {q}^{2} [/tex]

Ответ:

Объяснение:

4)  (3/4x - 0.5y)^2=9x²/16 - 3xy/4 + y²/4.

5)  (1 2/3c +0.6)^2=(5/3c + 0.6)² = 25c²/9 + 2c + 0.36.

6)  (5/6p-3/5q)^2 = 25p²/36 - pq + 9/25q².