140° Вправа 140Алгебра 8 клас Тарасенкова 2025 · § 4 · стор. 46

140. Знайдіть суму дробів.

1) ${\displaystyle \frac{2}{7ab}+\frac{3}{7ab}=}$${\displaystyle \frac{2+3}{7ab}=}$${\displaystyle \frac{5}{7ab}}$;

2) ${\displaystyle \frac{3y}{9ac}+\frac{4y}{9ac}=}$${\displaystyle \frac{3y+4y}{9ac}=}$${\displaystyle \frac{7y}{9ac}}$;

3) ${\displaystyle \frac{3xy}{2a^{2}b}+\frac{2xy}{2a^{2}b}=}$${\displaystyle \frac{3xy+2xy}{2a^{2}b}=}$${\displaystyle \frac{5xy}{2a^{2}b}}$;

4) ${\displaystyle \frac{3a}{2a+b}+\frac{4a}{2a+b}=}$${\displaystyle \frac{3a+4a}{2a+b}=}$${\displaystyle \frac{7a}{2a+b}}$;

5) ${\displaystyle \frac{5y}{a-c}+\frac{2y}{a-c}=}$${\displaystyle \frac{5y+2y}{a-c}=}$${\displaystyle \frac{7y}{a-c}}$;

6) ${\displaystyle \frac{3x}{a^2+b}+\frac{2x}{a^2+b}=}$${\displaystyle \frac{3x+2x}{a^2+b}=}$${\displaystyle \frac{5x}{a^2+b}}$.