Tìmx biết: a) x + 3/8 x 6/12 = 2 1/4 b) x – 5 3/4= 27/6 x 16/9 c) x x5 1/3 = 3 3/5 + 1 2/5 d) x : 1 2/7 + 2 =

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1. Đáp án:

    

   Giải thích các bước giải:

   Tìm x :

   a)

   x + $\frac{3}{8}$ × $\frac{6}{12}$ = 2$\frac{1}{4}$

   x + $\frac{3}{16}$ = $\frac{9}{4}$

   x = $\frac{9}{4}$ – $\frac{3}{16}$

   x = $\frac{33}{16}$

   b)

   x – 5$\frac{3}{4}$ = $\frac{27}{6}$ × $\frac{16}{9}$

   x – $\frac{23}{4}$ = 8

   x = 8 + $\frac{23}{4}$

   x = $\frac{55}{4}$

   c)

   x × 5$\frac{1}{3}$ = 3$\frac{3}{5}$ + 1$\frac{2}{5}$

   x × $\frac{16}{3}$ = $\frac{18}{5}$ + $\frac{7}{5}$

   x × $\frac{16}{3}$ = 3

   x = 3 : $\frac{16}{3}$

   x = $\frac{9}{16}$

   d)

   x : 1$\frac{2}{7}$ + 2 = 3$\frac{8}{9}$

   x : $\frac{9}{7}$ + 2 = $\frac{35}{9}$

   x : $\frac{9}{7}$ = $\frac{35}{9}$ – 2

   x : $\frac{9}{7}$ = $\frac{17}{9}$

   x = $\frac{17}{9}$ × $\frac{9}{7}$

   x = $\frac{51}{31}$

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2. a)

   x + 3/8 x 6/12 = 2  1/4

   x + 3/16 = 9/4

   x = 9/4 – 3/16

   x = 33/16

   b)

   x – 5  3/4 = 27/6 x 16/9

   x – 23/4 = 8

   x = 8 + 23/4

   x = 55/4

   c)

   x x 5  1/3 = 3  3/5 + 1  2/5

   x x 16/3 = 18/5 + 7/5

   x x 16/3 = 5

   x = 5 : 16/3

   x = 15/16

   d)

   x : 1  2/7 + 2 = 3  8/9

   x : 9/7 + 2 = 35/9

   x : 9/7 = 35/9 – 2

   x : 9/7 = 17/9

   x = 17/9 x 9/7

   x = 51/31

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