Môn Toán Lớp 2: Tìm x : a) x – 5/12 = 2/9 ; b) x – 3/4 = 17/2 ; c) X x 7/4 = 21/36 ; x : 27/16 = 8/9

Trả Lời

1. Giải đáp+Lời giải và giải thích chi tiết:

   $a)x-\dfrac{5}{12}=$$\dfrac{2}{9}$

   $x=\dfrac{2}{9}+$$\dfrac{5}{12}$

   $x=\dfrac{8+15}{36}$$x=\dfrac{23}{36}$

   $b)x-\dfrac{3}{4}=$$\dfrac{17}{2}$

   $x=\dfrac{17}{2}+$$\dfrac{3}{4}$

   $x=\dfrac{34+3}{4}$

   $x=\dfrac{37}{4}$

   $c)x×\dfrac{7}{4}=$$\dfrac{21}{36}$

   $x×\dfrac{7}{4}=$$\dfrac{7}{12}$

   $x=\dfrac{7}{12}:$$\dfrac{7}{4}$

   $x=\dfrac{1}{3}$

   $d)x:\dfrac{27}{16}=$$\dfrac{8}{9}$

   $x=\dfrac{8}{9}.$$\dfrac{27}{16}$

   $x=\dfrac{3}{2}$

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   Trả lời
2. Giải đáp:

   bb{a}) x – 5/12 = 2/9

   x = 2/9 + 5/12

   x = 8/36 + 15/36

   x = 23/36

   Vậy x = 23/36.

   bb{b}) x – 3/4 = 17/2

   x = 17/2 + 3/4

   x = 34/4 + 3/4

   x = 37/4

   Vậy x = 37/4.

   bb{c}) x xx 7/4 = 21/36

   x xx 7/4 = 7/12

   x = 7/12 : 7/4

   x = 7/12 . 4/7

   x = 1/3

   x = 1/3

   Vậy x = 1/3.

   bb{d}) x : 27/16 = 8/9

   x = 8/9 . 27/16

   x = 3/2

   Vậy x = 3/2.

   Trả lời