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`@` `\text {Ans}`

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`(x - 3,5) \div 1 1/2 - 2,5 = -1 3/4`

`=> (x-3,5) \div 1 1/2 = -1 3/4 + 2,5`

`=> (x-3,5) \div 1 1/2 = 3/4`

`=> x - 3,5 = 3/4 * 1 1/2`

`=> x - 3,5 = 9/8`

`=> x = 9/8 + 3,5`

`=> x = 37/8`

Vậy, `x = 37/8.`

a: \(\Leftrightarrow\left(x-\dfrac{2}{5}\right):\dfrac{3}{2}=-\dfrac{5}{4}+\dfrac{5}{2}=\dfrac{5}{4}\)

\(\Leftrightarrow x-\dfrac{2}{5}=\dfrac{5}{4}\cdot\dfrac{3}{2}=\dfrac{15}{8}\)

hay x=91/40

b: \(\Leftrightarrow\left(2.5x-3.6\right)=-1\cdot\dfrac{12}{7}=\dfrac{-12}{7}\)

=>2,5x=66/35

hay x=132/175

c: \(\Leftrightarrow\left(\dfrac{15}{4}-2x\right)=\dfrac{19}{9}:\dfrac{4}{3}=\dfrac{19}{9}\cdot\dfrac{3}{4}=\dfrac{19}{12}\)

=>2x=15/4-19/12=45/12-19/12=26/12

=>x=13/12

10 tháng 4 2018

a, x= 2 x 2,5x 3,1

    x=15,5

b, x= 32,8:1,2;8,2

    x=10/3

c, x=(3/4x15/16 +1) :3

    x=109/192

d, x= 2,x13,7:2,5-3,7

    x=10

k cho mình nha!

10 tháng 4 2018

a, x= 15.5

b x= 10/3

c x= 0.6

d x= 10

4 tháng 5 2018

a) 3x-1=16*3/4*15

3x=48/60+60/60

3x=108/60

x=0,6

b) 2,5*(x+3,7)=34,25

x+3,7=13,7

x=10

15 tháng 10 2017

\(\dfrac{15}{4}-2,5:\left|\dfrac{3}{4}.x+\dfrac{1}{2}\right|=3\)

\(\Rightarrow2,5:\left|\dfrac{3}{4}.x+\dfrac{1}{2}\right|=\dfrac{15}{4}-3\)

\(\Rightarrow2,5:\left|\dfrac{3}{4}.x+\dfrac{1}{2}\right|=\dfrac{3}{4}\)

\(\Rightarrow\left|\dfrac{3}{4}x+\dfrac{1}{2}\right|=2,5:\dfrac{3}{4}\)

\(\Rightarrow\left|\dfrac{3}{4}x+\dfrac{1}{2}\right|=\dfrac{10}{3}\)

\(\Rightarrow\left[{}\begin{matrix}\dfrac{3}{4}x+\dfrac{1}{2}=\dfrac{10}{3}\\\dfrac{3}{4}x+\dfrac{1}{2}=-\dfrac{10}{3}\end{matrix}\right.\) \(\Rightarrow\left[{}\begin{matrix}\dfrac{3}{4}x=\dfrac{17}{6}\\\dfrac{3}{4}x=\dfrac{-23}{6}\end{matrix}\right.\) \(\Rightarrow\left[{}\begin{matrix}x=\dfrac{34}{9}\\x=\dfrac{-46}{9}\end{matrix}\right.\)

Vậy............