Đề thiếu. Bạn coi lại đề.

(x + \(\dfrac{3}{5}\))² + 1\(\dfrac{16}{25}=9\%:4,5\%\)
<=> x² + (\(\dfrac{3}{5}\))² + 1\(\dfrac{16}{25}=2\)
<=> x² + \(\dfrac{9}{25}+\dfrac{41}{25}=2\)
<=> x² + 2 = 2
<=> x² = 0
<=> x = 0
@Khánh Linh

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Bài 1: Tìm x

a) Ta có: \(\left(7x-11\right)^3=2^5\cdot5^2+200\)

\(\Leftrightarrow\left(7x-11\right)^3=32\cdot25+200=1000\)

\(\Leftrightarrow7x-11=10\)

\(\Leftrightarrow7x=21\)

hay x=3

Vậy: x=3

b) Ta có: \(720:\left(41-\left(2x-5\right)\right)=2^3\cdot5\)

\(\Leftrightarrow720:\left(41-2x+5\right)=8\cdot5=40\)

\(\Leftrightarrow-2x+46=18\)

\(\Leftrightarrow-2x=18-46=-28\)

hay x=14

Vậy: x=14

c) Ta có: \(2\cdot3^x=10\cdot3^{12}+8\cdot27^4\)

\(\Leftrightarrow2\cdot3^x=10\cdot3^{12}+8\cdot3^{12}\)

\(\Leftrightarrow2\cdot3^x=18\cdot3^{12}\)

\(\Leftrightarrow3^x=\dfrac{18\cdot3^{12}}{2}=9\cdot3^{12}\)

\(\Leftrightarrow3^x=3^2\cdot3^{12}=3^{14}\)

hay x=14

Vậy: x=14

A (7x-11)³=2⁵.5²+200

    (7x-11)³=800+200

    (7x-11)³=1000

    (7x-11)³=10³

    7x-11=10

     7x=10+11

     7x=21

       x=21:7

       x=3

B 720:(41-(2x-5))=2³.5

   720:(41-(2x-5))=40

             41-(2x-5)=720:40

             41-(2x-5)=18

                    2x-5=41-18

                    2x-5=23

                       2x=23+5

                       2x=28

                         x=28:2

                         x=14

 C 2.3^x=10.3¹²+8.27⁴

    2.3^x=10.3¹²+8.(3^3.4)

      2.3^x=10.3¹²+8.3¹²

      2.3^x=3¹².(10+8)

     2.3^x=3¹².18

        3^x=( 3¹².18):2

        3^x=3¹².9

        3^x=3¹² .3²

        3^x=3¹⁴

          3^x=14

        x=14

a, \(\left(\frac{1}{3}-\frac{1}{2}\right)^x-1=\frac{1}{36}\)

=> \(\left(\frac{-1}{6}\right)^x=\frac{1}{36}+1\)

=> \(\left(\frac{-1}{6}\right)^x=\frac{37}{36}\)

vì ko có số nào mũ với \(\left(\frac{-1}{6}\right)=\frac{37}{36}\) => x ko tồn tại

b, \(\frac{25}{5}^x=\frac{1}{125}=>5^x=\frac{1}{125}=>5^x=5^{\frac{1}{125}}\)

=> x = \(\frac{1}{125}\)

Bạn ơi đề là \(\left(\frac{1}{3}-\frac{1}{2}\right)^{x-1}=\frac{1}{36}\) hay \(\left(\frac{1}{3}-\frac{1}{2}\right)^x-1=\frac{1}{36}\) vậy.

\(\left(\frac{1}{3}-\frac{1}{2}\right)^{x-1}=\frac{1}{36}\)

\(\Rightarrow\left(-\frac{1}{6}\right)^{x-1}=\frac{1}{36}\)

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

\(\Rightarrow x-1=2\)

\(\Rightarrow x=3\)

b)\(\frac{25}{5^x}=\frac{1}{125}\)

\(\Rightarrow\frac{25}{5^x}=\frac{25}{3125}\)

\(\Rightarrow\frac{25}{5^x}=\frac{25}{5^5}\)

\(\Rightarrow x=5\)

   a  25 + 8 + 12 + 25 = 70            b  87 + [ - 750   ] + 2018 - 13 + 750 = 2842             c [ 45 + 12 - 13 ]  -  [ 45 - 13 + 12 ]  =  90                minh tinh gom bn ah

rk đúng hay sai đây

BT1 :thực hành phép tính

4/3+-11/31+3/10-20/31-2/5 = 7/30

7/12-1/-16+3/4 = 67/48

2/11.-5/4+-9/11.5/4+ 1 và 3/4 = -1/4 * và 3/4 là sao bạn *

-9/27-25/75 = -2/3

\(\dfrac{1}{3}x-\dfrac{3}{4}=\dfrac{5}{4}\\ \dfrac{1}{3}x=\dfrac{5}{4}+\dfrac{3}{4}\\ \dfrac{1}{3}x=2\\ x=2:\dfrac{1}{3}\\ x=6\)

1/3x-3/4=5/4

1/3x       =5/4+3/4

1/3x        =2

     x       =2:1/3

     x       =6

\(1/3x=5/4+3/4=>1/3x=8/4=>x=2:1/3=2*3=>x=6\)