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Объяснение:[tex]\frac{a^{2}+ax-a^{2}-x^{2} }{a+x} *\frac{2a^{2}-2ax+4ax }{x((a-x)}=\frac{ax-x^{2} }{a+x}*\frac{2a^{2} +2ax}{x(a-x)} =\frac{x(a-x)}{a+x}*\frac{2a(a+x)}{x(a-x} =2a[/tex]

[tex]\frac{a(m^{2}-n^{2} }{(m+n)^{2} } *\frac{3(m+n)}{a(m-n)^{2} }= \frac{(m-n)*((m+n)*3(m+n)}{(m+n)^{2}*(m-n)^2 } =\frac{3}{m-n}[/tex]