a)

\(\dfrac{-2}{3}\cdot\left(x-\dfrac{1}{4}\right)=\dfrac{1}{3}\cdot\left(2x-1\right)\\ \dfrac{-2}{3}x-\left(\dfrac{-1}{6}\right)=\dfrac{2}{3}x-\dfrac{1}{3}\\ \dfrac{-2}{3}x+\dfrac{1}{6}=\dfrac{2}{3}x-\dfrac{1}{3}\\ \dfrac{-2}{3}x-\dfrac{2}{3}x=\dfrac{-1}{3}-\dfrac{1}{6}\\ -x\cdot\left(\dfrac{2}{3}+\dfrac{2}{3}\right)=\dfrac{-2}{6}-\dfrac{1}{6}\\ \dfrac{-4}{3}x=\dfrac{-1}{2}\\ x=\dfrac{-1}{2}:\dfrac{-4}{3}\\ x=\dfrac{-1}{2}\cdot\dfrac{-3}{4}\\ x=\dfrac{3}{8}\)

a) (27+65)+(346-27-65)

= 27+65+346-27-65

= (27-27)+(65-65)+346

= 0 + 0 + 346

= 346

b) (42-69+17)-(42+17)

= 42-69+17 – 42 – 17

= (42-42)+(17-17)-69

= 0 + 0 – 69

= -69

a)(27+65)+(346-27-65)

=27+65+345-27-65

=(27-27)+(65-65)+346

=0+0+346

=346

b) (42-69+17)-(42+17)

=42-69+17-42-17

=(42-42)-69+(17-17)

=0-69+0

=-69

A = 344 x 687 - 343

A = (343 + 1) x 687 - 343

A = 343 x 687 + 687 - 343

A = 343 x 687 + (687 - 343)

A = 343 x 687 + 345 = B

Vậy A = B

\(\frac{1946\times131+1600}{132\times1946-346}\)

\(=\frac{1946\times131+1600}{131\times1946+1946-346}\)

\(=\frac{1946\times131+1600}{131\times1946+1600}=1\)

 0,9913769643

\(\frac{1946x131+1000}{132x1946-946}=\frac{1946x131+1000}{\left(131+1\right)x1946-946}=\frac{1946x131+1000}{131x1946+1946-946}=\frac{1946x131+1000}{1946x131+1000}=1\)

132x1946 phải trừ đi 946 mới đúng đề bạn nhé

= \(\frac{255926}{256526}=0,9976610558\)

K MK NHA

=>|x-3|+5|x-3|=360

=>|x-3|=60

=>x-3=60 hoặc x-3=-60

=>x=63 hoặc x=-57

giao cho mik

a)346.124 - 7.(2x - 1 ) = 346

      42904 - 7.(2x - 1 ) = 346

                  7.(2x - 1 ) = 42904 - 346

                  7.(2x - 1 ) = 42558

                        2x - 1 = 42558 :7

                        2x - 1 = 42558/7

                             2x = 42558/7+1 

                             2x = 42565/7

                               x = 42565/7:2

                               x = 42565/14

a)346.124 - 7.(2x - 1 ) = 346

      42904 - 7.(2x - 1 ) = 346

                  7.(2x - 1 ) = 42904 - 346

                  7.(2x - 1 ) = 42558

                        2x - 1 = 42558 :7

                        2x - 1 = 42558/7

                             2x = 42558/7+1 

                             2x = 42565/7

                               x = 42565/7:2

                               x = 42565/14

2179x1862

=>Tích là 40515258

3789:231

=>Thương là 16, dư là 93

9848:345

=>Thương là 28, dư là 188

\(123-\left(x+345\right)-2x=1792\)

\(\Leftrightarrow123-x-345-2x=1792\)

\(\Rightarrow-222-3x=1792\)

\(\Leftrightarrow-3x=1792+\left(-222\right)\)

\(\Leftrightarrow-3x=1570\)

\(\Rightarrow x=\frac{-1570}{3}\)

123 – (x + 345) – 2x = 1792

123 – x – 345 – 2x = 1792

–222 – 3x = 1792 

–3x = 1792 + 222

–3x = 2014

=> x = – 2014/3