a) 4/9 + 1,2(31) -0,(13) b) 2 1/2-3,4(12) -4/3 ( hỗn số)

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1. a) $\dfrac{4}{9}+1,2(31)-0,(13)$ 

   $=\dfrac{4}{9}$ $+$ $\dfrac{1219}{990}$ $-$ $\dfrac{13}{99}$

   $=\dfrac{440}{990}$ $+$ $\dfrac{1219}{990}$ $-$ $\dfrac{130}{990}$

   $=\dfrac{-909}{990}$ $=\dfrac{-101}{110}$

   b) $2\dfrac{1}{2}-3,4(12)$ $-$ $\dfrac{4}{3}$ 

   $=\dfrac{5}{2}$ $-$ $\dfrac{563}{165}$ $-$ $\dfrac{4}{3}$

   $=\dfrac{825}{330}$ $-$ $\dfrac{1126}{330}$ $-$ $\dfrac{440}{330}$

   $=-\dfrac{741}{330}$ $=-\dfrac{247}{110}$

    

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2. `4/9 + 1,2(31) – 0,(13)`

   ` = 4/9 + 1219/990 – 13/99`

   ` = 553/330 – 13/99`

   ` = 139/90`

   ——

   ` 2 1/2 – 3,4(12) – 4/3`

   ` = 5/2 – 563/165 – 4/3`

   ` = -301/330 – 4/3`

   ` = -247/110`

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