a.2/3x+1/4=7/12 b.x/7 =-6/21 c5 4/7:x=13 f.(2 4/5 x-50) : 2/3 = 51 g. 4 2/3 :x = 4 4/9 +1 h (x+1/2). (2/3 – 2x)=0 i17/2 -|2x – 3/4| = -7/4

a.2/3x+1/4=7/12
b.x/7 =-6/21
c5 4/7:x=13
f.(2 4/5 x-50) : 2/3 = 51
g. 4 2/3 😡 = 4 4/9 +1
h (x+1/2). (2/3 – 2x)=0
i17/2 -|2x – 3/4| = -7/4

0 bình luận về “a.2/3x+1/4=7/12 b.x/7 =-6/21 c5 4/7:x=13 f.(2 4/5 x-50) : 2/3 = 51 g. 4 2/3 :x = 4 4/9 +1 h (x+1/2). (2/3 – 2x)=0 i17/2 -|2x – 3/4| = -7/4”

  1. Đáp án:

    $a.2/3x+1/4=7/12$

    $⇔ 2/3 x = 7/12 – 1/4$

    $⇔ 2/3 x = 1/3$

    $⇔ x = 1/3 : 2/3$

    $⇔ x = 0,5$

    $b.x/7 =-6/21$

    $⇔ x = -6/21 . 7$

    $⇔ x = -2$

    $c. 5$$\dfrac{4}{7}$ $:x=13$

    $⇔ 39/7 : x = 13$

    $⇔ x = 39/7 : 13$

    $⇔ x = 3/7$

    $f.(2$$\dfrac{4}{5}$ $x-50) : 2/3 = 51$

    $⇔ 2,8 x – 50 = 51. 2/3$

    $⇔ 2,8 x – 50 = 34$

    $⇔ 2,8 x = 84$

    $⇔ x = 84: 2,8$

    $⇔ x = 30$

    $g. 4$$\dfrac{2}{3}$ $ 😡 = 4$$\dfrac{4}{9}$  $+1$

    $⇔14/3 : x = 40/9 + 1 $

    $⇔ 14/3 : x = 49/9$

    $⇔ x = 14/3 : 49/9$

    $⇔ x = 6/7$

    $h (x+1/2). (2/3 – 2x)=0$

    $⇔ x+1/2 = 0$ hoặc $2/3 – 2x=0$

    $⇔ x= -1/2$ hoặc $2x=2/3$

    $⇔ x=-1/2$ hoặc$ x=1/3$

    $i 17/2 -|2x – 3/4| = -7/4$

    $⇔ |2x-3/4| = 17/2 – (-7/4)$

    $⇔ |2x-3/4| = 10,25$

    $⇔ 2x-3/4 = 10,25$ hoặc $2x-3/4 = -10,25$

    $⇔ 2x = 11$ hoặc $2x = -9,5$

    $⇔ x = 11/2$ hoặc $x = -4,75$

    BẠN THAM KHẢO NHA!!!

     

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