Giải hộ mk nha : bải rút gọn a) 2.14/7.8 b)3.7.11/22.9 c)3m+3n/m-n d)ax+ay/bx+by e)8a-8t/(a-t).(a-t) f)2m+2n/(m+n).(m-n)

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1. a, $\dfrac{2.14}{7.8}$ 

   $= \dfrac{2^2.7}{2^3.7}$

   $=\dfrac{1}{2}$ 

   b, $\dfrac{3.7.11}{22.9}$

   $=\dfrac{3.7.11}{2.3^2.11}$

   $=\dfrac{7}{2.3}=\dfrac{7}{6}$

   c, (không rút gọn được)

   d, $\dfrac{ax+ay}{bx+by}$ ($x\neq -y$, $b\neq 0$)

   $=\dfrac{a(x+y)}{b(x+y)}$

   $=\dfrac{a}{b}$

   e, $\dfrac{8a-8t}{(a-t)(a-t)}$ ($a\neq t$)

   $=\dfrac{8(a-t)}{(a-t)(a-t)}$

   $=\dfrac{8}{a-t}$ 

   f, $\dfrac{2m+2n}{(m+n)(m-n)}$ ($m\neq \pm n$)

   $=\dfrac{2(m+n)}{(m+n)(m-n)}$

   $=\dfrac{2}{m-n}$

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2. a) $\dfrac{2.14}{7.8}$

       $=\dfrac{2.2.7}{7.2.2.2}$

       $=\dfrac{1}{2}$

   b) $\dfrac{3.7.11}{22.9}$

        $=\dfrac{3.7.11}{11.2.3.3}$

        $=\dfrac{7}{6}$

   c) $\dfrac{3m+3n}{m-n}$ (bạn xem lại đề)

   d) $\dfrac{ax+ay}{bx+by}$

        $=\dfrac{a(x+y)}{b(x+y)}$

        $=\dfrac{a}{b}$

   e) $\dfrac{8a-8t}{(a-t)(a-t)}$

       $=\dfrac{8(a-t)}{(a-t)(a-t)}$

       $=\dfrac{8}{a-t}$

   f) $\dfrac{2m+2n}{(m+n)(m-n)}$

       $=\dfrac{2(m+n)}{(m+n)(m-n)}$

       $=\dfrac{2}{m-n}$

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