\(2.3^x=10.3^{12}+8.\left(3^3\right)^4\)

\(2.3^x=10.3^{12}+8.3^{12}\)

\(2.3^x=3^{12}.\left(10+8\right)\)

\(2.3^x=3^{12}.18\)

\(3^x=3^{12}.18:2\)

\(3^x=3^{12}.9\)

\(3^x=3^{12}.3^2\)

\(3^x=3^{14}\)

\(\Rightarrow x=14\)

2.3^x=10.3¹²+8.27⁴

2.3^x=10.3¹²+2³.3¹²

2.3^x=3¹².18

2.3^x=3¹².3².2

2.3^x=3¹⁴.2

=>x=14

\(\Rightarrow6x=5312\)

\(\Rightarrow x=5312:6\)

\(\Rightarrow x=885,3333333\)

tíc nha

\(2.3x=10.312+8.274\)

\(=2.3x=3120+2192\)

\(2.3x=5312\)

\(3x=5312:2\)

\(3x=2656\)

\(x=2656:3\)

\(x=\frac{2556}{3}\)

......

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

\(2\cdot3^x=10\cdot3^{12}+7\cdot27^4\)

\(\Rightarrow2\cdot3^x=10\cdot3^{12}+7\cdot3^{12}\)

\(\Rightarrow2\cdot3^x=3^{12}\cdot\left(10+7\right)\)

\(\Rightarrow2\cdot3^x=3^{12}\cdot17\)

Xem lại đề

\(2\times3^x=10\times3^{12}+7\times27^4\)

\(2\times3^x=10\times531441+7\times531441\)

\(2\times3^x=531441\times\left(10+7\right)\)

\(2\times3^x=531441\times17\)

\(2\times3^x=9034497\)

\(3^x=4517248,5\)

\(3^x\sim3^{13,948}\)

\(x\sim13,948\)

\(\Leftrightarrow2.3^x=10.3^{12}+7.3^{12}=17.3^{12}\)

Đề bài sai VT chẵn mà VP lại lẻ

1 How long do you live in HN

2 How often did you go to the movies

3 What did Mrs Robinson buy

4 When was your father in Nghe An

5 How do they go to school

6 Why didn't she go to class

7 Who left home at 7o'clock yesterday

8 What subject does he study in the high school

9 What is your favorite hobby

10 How far is it

ko có ảnh bn ơi

Đề bài là gì zạ? 

Sục hỗn hợp vào dung dịch Ca(OH)₂ dư : 

- CO₂ phản ứng giữ lại 

- O₂ tinh khiết bay ra 

Cho chất rắn CaCO₃ phản ứng với HCl thu được CO₂

Ca(OH)₂ + CO₂ => CaCO₃ + H₂O

CaCO₃ + 2HCl => CaCl₂ + CO₂ + H₂O

- Sục các khí qua nước vôi trong thu được kết tủa và tách ra được Oxi

PTHH: \(Ca\left(OH\right)_2+CO_2\rightarrow CaCO_3\downarrow+H_2O\)

- Nung nóng kết tủa thu được CO₂

PTHH: \(CaCO_3\xrightarrow[]{t^o}CaO+CO_2\uparrow\)

a: \(A=\left(x+2+2x-5\right)^2=\left(3x-3\right)^2\)

\(=\left(\dfrac{3}{4}-3\right)^2=\left(-\dfrac{9}{4}\right)^2=\dfrac{81}{16}\)