GTLN của A là 13/6 khi x=0 nha

vì nếu x khác 0 thì /2x+7/</2./2x+7/

\(\left(-\frac{7}{3}+\frac{13}{6}\right)-2x=-\frac{7}{3}\)

\(-\frac{1}{6}-2x=-\frac{7}{6}\)

\(2x=-\frac{1}{6}-\left(-\frac{7}{6}\right)\)

\(2x=-\frac{1}{6}+\frac{7}{6}\)

\(2x=1\)

\(x=\frac{1}{2}\)

  (-7/3+13/6)-2x=-7/6

(-14/6+13/6)-2x=-7/6

           (-1/6)-2x=-7/6

             -1/6-2x=-7/6

                     2x=-1/6-(-7/6)

                     2x=-1/6+7/6

                     2x=6/6

                    2x=1

                      x=1/2

CHÚC BẠN HỌC TỐT

a, 4,5 - 2x . 147 = 1114

2x . 147 = 4,5 - 1114

2x . 147 = -1109,5

2x = -1109,5 / 147

2x = \(-\dfrac{317}{42}\)

x = \(-\dfrac{317}{42}:2\)

x = \(-\dfrac{317}{84}\)

b, ( x + 14 - 13 ) : ( 2 + 16 - 14 ) = 746

( x + 1 ) : 4 = 746

x + 1 = 746 . 4

x + 1 = 2984

x = 2984 - 1

x = 2983

c, \(\dfrac{13}{15}-\left(\dfrac{13}{21}+x\right).\dfrac{7}{12}=\dfrac{7}{10}\)

\(\left(\dfrac{13}{21}+x\right).\dfrac{7}{12}=\dfrac{13}{15}-\dfrac{7}{10}\)

\(\left(\dfrac{13}{21}+x\right).\dfrac{7}{12}=\dfrac{1}{6}\)

\(\dfrac{13}{21}+x=\dfrac{1}{6}:\dfrac{7}{12}\)

\(\dfrac{13}{21}+x=\dfrac{2}{7}\)

\(x=\dfrac{2}{7}-\dfrac{13}{21}\)

\(x=-\dfrac{1}{3}\)

Gửi cậu ảnh

Ta có:\(\left|2x-13\right|\ge0\Rightarrow\left|2x-13\right|+\left(-\frac{7}{2}\right)\ge-\frac{7}{2}\)

\(\Rightarrow\left|2x-13\right|-\frac{7}{2}\ge-\frac{7}{2}\)

Dấu "=" xảy ra khi \(2x-13=0\Rightarrow2x=13\Rightarrow x=\frac{13}{2}\)

kb lqmb vs mk ko mk là P.A.D8a1

Làm hết thì đã lên " THÁNH "

a, 2^x + 2^x+1 + 2^x+2 + 2^x+3 = 480

=> 2^x + 2^x.2 + 2^x.2² + 2^x.2³ = 480

=> 2^x.(1 + 2 + 2² + 2³) = 480

=> 2^x.15 = 480

=> 2^x = 480 : 15

=> 2^x = 32 = 2⁵

=> x = 5

b, |7 - x| = -13 - 5.(-8)

|7 - x| = 27

\(\Rightarrow\hept{\begin{cases}7-x=27\\-7+x=27\end{cases}}\Rightarrow\hept{\begin{cases}x=-20\\x=34\end{cases}}\)

a) (2x+10)(x²+3)=0

(1) 2x+10=0 (2) x²+3=0

=> 2x=0+10 =>x²=0-3

=> 2x=10 =>x²=-3(Loại)

=>x=10:2

=>x=5

Vậy x=5

b)-12(x-5)+7(3-x)=5

-12.x+12.5+7.3+7.(-x)=5

-12.x+60+21+7.(-x)=5

-12.x+60+21+(-7).x=5

[(-12)+(-7)].x+60+21=5

-19x+81=5

-19x=5-81

-19x=-76

x=-76:(-19)

x=4

Vậy x=4.