какому из приведёных дробей тотожно ровняется дробь [tex]\frac{5b-15}{b^{2}-9} [/tex]:a)[tex]\frac{b-3}{5} [/tex]

                             b)[tex] \frac{b+3}{5} [/tex]                                      

                             c) [tex] \frac{5}{b-3} [/tex]         

                             d) [tex] \frac{5}{b+3} [/tex]

выполните сложение[tex]\frac{4-m}{m-3}+\frac{2m-5}{3-m}[/tex]:

a)\frac{m-1}{m-3}

b) \frac{1-3m}{m-3}

c) 3

d)-3

 

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