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

Đáp án+Giải thích các bước giải:

$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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