Question

срочно!!!!!!!!!!!!!!!!!!​

Answer 1

1) $\frac{a}{8} +\frac{a}{12} =\frac{a*3+a*2}{24} =\frac{5a}{24}$

2) $\frac{4x}{15} -\frac{2x}{9} =\frac{4x*3-2x*5}{45} =\frac{12x-10x}{45} =\frac{2x}{45}$

3) $\frac{6c}{7a} -\frac{3d}{14a} =\frac{6c*2-3d}{14a} =\frac{12c-3d}{14a}$

4) $\frac{m}{a^{2}b } -\frac{n}{ab^{3} } =\frac{mb^{2} -na}{a^{2}b^{3} }$

5) $\frac{a^{2} }{b^{5}c^{4} } -\frac{a^{3} }{b^{3}c^{6} } =\frac{a^{2}*c^{2} -a^{3} *b^{2} }{b^{5}c^{6} }$

6) $\frac{5m}{18a^{7} } +\frac{7n}{12a^{4} } =\frac{5m*2+7n*3a^{3} }{36a^{7} } =\frac{10m+21na^{3} }{36a^{7} }$