144° Вправа 144Алгебра 8 клас Тарасенкова 2025 · § 4 · стор. 46

144. Виконайте віднімання дробів.

1) ${\displaystyle \frac{2}{5y}-\frac{9}{5y}=}$${\displaystyle \frac{2-9}{5y}=}$${\displaystyle -\frac{7}{5y}}$;

2) ${\displaystyle \frac{2a}{a+4}-\frac{3a}{a+4}=}$${\displaystyle \frac{2a-3a}{a+4}=}$${\displaystyle -\frac{a}{a+4}}$;

3) ${\displaystyle \frac{9b}{a^2-1}-\frac{8b}{a^2-1}=}$${\displaystyle \frac{9b-8b}{a^2-1}=}$${\displaystyle \frac{b}{a^2-1}}$;

4) ${\displaystyle \frac{9ac}{4x^5}-\frac{5ac}{4x^5}=}$${\displaystyle \frac{9ac-5ac}{4x^5}=}$${\displaystyle \frac{\stackrel{1}{\cancel{4}}ac}{\underset{1}{\cancel{4}}{x}^5}=}$${\displaystyle \frac{ac}{x^5}}$;

5) ${\displaystyle \frac{6c}{1+a}-\frac{8c}{1+a}=}$${\displaystyle \frac{6c-8c}{1+a}=}$${\displaystyle -\frac{2c}{1+a}}$;

6) ${\displaystyle \frac{13a}{1+x}-\frac{3a}{1+x}=}$${\displaystyle \frac{13a-3a}{1+x}=}$${\displaystyle \frac{10a}{1+x}}$.