148 Вправа 148Алгебра 8 клас Бевз 2025 · § 4 · стор. 35

148. Спрости вираз.

а) ${\displaystyle \frac{3}{5ac}-\frac{2}{5ac}+\frac{4}{5ac}=}$${\displaystyle \frac{3-2+4}{5ac}=}$${\displaystyle \frac{\cancel{5}}{ac\cancel{5}}=}$${\displaystyle \frac{1}{ac}}$;

б) ${\displaystyle \frac{5n}{3am}-\frac{2,5n}{3am}+\frac{0,5n}{3am}=}$${\displaystyle \frac{5n-2,5n+0,5n}{3am}=}$${\displaystyle \frac{\cancel{3}n}{\cancel{3}am}=}$${\displaystyle \frac{n}{am}}$;

в) ${\displaystyle \frac{2a}{a+x}+\frac{2x-a}{a+x}-\frac{x}{a+x}=}$${\displaystyle \frac{2a+2x-a-x}{a+x}=}$${\displaystyle \frac{\cancel{\left(a+x\right)}}{\cancel{\left(a+x\right)}}=}$${\displaystyle 1}$;

г) ${\displaystyle \frac{2c}{c-x}-\frac{c}{c-x}-\frac{x}{c-x}=}$${\displaystyle \frac{2c-c-x}{c-x}=}$${\displaystyle \frac{\cancel{\left(c-x\right)}}{\cancel{\left(c-x\right)}}=}$${\displaystyle 1}$.