Упростить выражение . Пожалуйста помогите какие сможете
1.[tex] \frac{a+b}{2b}*( \frac{b}{2b-2a}+ \frac{ab}{a^{2}-b^{2} } )[/tex]
[tex] 2 .\frac{a+b}{2b}*( \frac{b}{2b-2a}+ \frac{ab}{a^{2}-b^{2} } ).
( \frac{s}{s+t}+ \frac{t}{s-t}): \frac{st-t^{2} }{s^{2}-t^{2} } 3.
( \frac{y}{y^{2}-xy }+ \frac{x}{y^{2}-xy})* \frac{xy}{x+y} [/tex]
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