147 Вправа 147Алгебра 8 клас Бевз 2025 · § 4 · стор. 35

147. Спрости вираз.

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

б) ${\displaystyle \frac{a}{7m}+\frac{2a}{7m}+\frac{4a}{7m}=}$${\displaystyle \frac{a+2a+4a}{7m}=}$${\displaystyle \frac{a\cancel{7}}{m\cancel{7}}=}$${\displaystyle \frac{a}{m}}$;

в) ${\displaystyle \frac{m+c}{2x}+\frac{m-c}{2x}=}$${\displaystyle \frac{c+m+m-c}{2x}=}$${\displaystyle \frac{m\cancel{2}}{x\cancel{2}}=}$${\displaystyle \frac{m}{x}}$;

г) ${\displaystyle \frac{2x}{0,5a}-\frac{x-c}{0,5a}-\frac{c}{0,5a}=}$${\displaystyle \frac{2x-(x-c)-c}{0,5a}}$=

=${\displaystyle \frac{2x-x+c-c}{0,5a}=}$${\displaystyle \frac{x}{0,5a}=}$${\displaystyle \frac{2x}{a}}$.