СОКРАТИТЬ и решить дроби 1) [tex] \frac{7b+2a-7 b^{2} }{b} [/tex] при a=9 b=12 ........2) [tex] \frac{ a^{2}+4a }{ a^{2}+ 8a+16 } [/tex] при a=-2......  3) [tex] \frac{2c-4}{cd-2d} [/tex] при с=0.5 d=5 ........4) [tex] \frac{ a^{11}- a^{4} }{ a^{-3} } [/tex] при a = -1/2 ......5)[tex] \frac{ x^{2}-4 }{ 4x^{2} } \frac{2x}{x+2} [/tex] при x=4
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