4). [tex]\frac{81}{9-k} -\frac{k^{2} }{9-k} = \frac{81-k^{2} }{9-k} =\frac{(9-k)(9+k)}{9-k}= 9+k[/tex]
5). [tex]\frac{10x}{2d-m} +\frac{5x}{m-2d} =\frac{10x}{2d-m} - \frac{5x}{2d-m} =\frac{10x-5x}{2d-m} =\frac{5x}{2d-m}[/tex]
6). [tex]\frac{4}{6n} +\frac{7}{8m} =\frac{32m+42n}{6n+8m}=\frac{2(16m+21n)}{3(2n+4m)} =[/tex]
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4). [tex]\frac{81}{9-k} -\frac{k^{2} }{9-k} = \frac{81-k^{2} }{9-k} =\frac{(9-k)(9+k)}{9-k}= 9+k[/tex]
5). [tex]\frac{10x}{2d-m} +\frac{5x}{m-2d} =\frac{10x}{2d-m} - \frac{5x}{2d-m} =\frac{10x-5x}{2d-m} =\frac{5x}{2d-m}[/tex]
6). [tex]\frac{4}{6n} +\frac{7}{8m} =\frac{32m+42n}{6n+8m}=\frac{2(16m+21n)}{3(2n+4m)} =[/tex]