Question

Найдите межрёбереная мыцы нару

Answer 1

A1. 1

$\frac{a+5b}{15} +\frac{2a+4b}{15} =\frac{a+5b+2a+4b}{15} =\frac{3a+9b}{15} =\frac{3(a+3b)}{15} =\frac{a+3b}{5}$

A2. 1

$\frac{b+c}{3a} -\frac{b-2c}{3a} =\frac{b+c-b+2c}{3a} =\frac{3c}{3a} =\frac{c}{a}$

A3. 3

$\frac{3x}{x^{3}-1} -\frac{4x-1}{1-x^{3}} -\frac{x^{2}}{1-x^{3}} =\frac{3x}{x^{3}-1} +\frac{4x-1}{x^{3}-1} +\frac{x^{2}}{x^{3}-1} =\frac{3x+4x-1+x^{2}}{x^{3}-1} =\frac{x^{2}+7x-1}{x^{3}-1}$

A4. 2

$-\frac{3c-5}{4-c^{2}} +\frac{3-2c}{c^{2}-4} =\frac{3c-5}{c^{2}-4} +\frac{3-2c}{c^{2}-4} =\frac{3c-5+3-2c}{c^{2}-4} =\frac{c-2}{(c-2)(c+2)} =\frac{1}{c+2} =\frac{1}{-3+2} =-1$