ПОМОГИТЕ ПОЖАЛУЙСТА!!!
Упростите выражение
а)[tex]\frac{2x+1}{12x^{2}y} +\frac{2-3y}{18xy^{2} }[/tex]
б)[tex]\frac{a+1}{2a(a-1)} -\frac{a-1}{2a(a+1)}[/tex]
г)[tex]\frac{a+4}{a} -\frac{a-1}{a+2}[/tex]
д)[tex]\frac{x+2}{2x-4} -\frac{3x-2}{x^{2} -2x}[/tex]
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