3/4 +5/8 1/3+3/4 2. 2,57+8,51+17,81 2/3+1/4+5/8 3: x – 2,13=5,45. x-1/4=3/8

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1. Đáp án:

    

   Giải thích các bước giải:

   $\frac{3}{4}$+$\frac{5}{8}$ 

   = $\frac{24}{32}$ +$\frac{20}{32}$ 

   = $\frac{64}{32}$ 

   = 2

   $\frac{1}{3}$ + $\frac{3}{4}$ 

   = $\frac{4}{12}$ + $\frac{9}{12}$ 

   = $\frac{13}{12}$ 

   2. 2,57 + 8,51 + 17,81

   = 5,14 + 26,32

   = 31,46

   2/3+1/4+5/8

   = $\frac{2}{3}$ + ( $\frac{1}{4}$ + $\frac{5}{8}$ )

   = $\frac{2}{3}$ + ( $\frac{2}{8}$ + $\frac{5}{8}$ )

   = $\frac{2}{3}$ + $\frac{7}{8}$ 

   = $\frac{16}{24}$ + $\frac{21}{24}$ 

   = $\frac{37}{24}$ 

   3: x – 2,13=5,45

   3 : x = 5,45 + 2,13

   3 : x = 7,58

   x= 7,58 . 3

   x= 22,74

   x-1/4=3/8

   x= $\frac{3}{8}$ + $\frac{1}{4}$ 

   x= $\frac{5}{8}$ 

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2. `\text{Bài 1 :}`

   `3/4 + 5/8 = 6/8 + 5/8 = 11/8`

   `1/3 + 3/4 = 4/12 + 9/12 = 13/12`

   `\text{Bài 2 :}`

   `2,57 + 8,51 + 17,81 = 11,08 + 17,81 = 28,89`

   `\text{Bài 3 :}`

   `x – 2,13 = 5,45`

   `        x   = 5,45 + 2,13`

   `        x   = 7,58`

   `x – 1/4 = 3/8`

   `       x   = 3/8 + 1/4`

   `       x   = 5/8`

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