7x - 2x = 6¹⁷ - 6¹⁵ + 44 : 11

x( 7 - 2 ) = 6^{17 - 15}  + 4

5x = 6² + 4 

5x = 36 + 4

5x = 40

  x = 40 : 5 

  x = 8 

x=2=-6-17 giải giúp mình nhé

A, 7x - x = 5^21 : 5^19 + 3 . 2^2 - 7^0

      6x     =    5^2 + 3 . 4 - 1

      6x     =    25 + 12 - 1

      6x     =    37 - 1

      6x     =      36

        x     =      6.

B, mình giải ra nhưng số to quá. Bạn thử kiểm tra lại đề xem.

C, 7x - 2x = 6^17 : 6^15 + 44 : 11

       5x      =    6^2 + 4

       5x      =    40

         x      =   8.

thank you Nguyen Thanh Van

 Tinh Tong

A=1+2+3+....+999

B=21+23+25+...+1001

C=23+24+...+127+128

D=15+17+19+21+...+151+153+155

\(a.\)\(7x-2x=6^{17}:6^{15}+44:11\)

\(\Leftrightarrow5x=6^2+4\)

\(\Leftrightarrow5x=36+4\)

\(\Leftrightarrow5x=40\)

\(\Leftrightarrow x=40:5\)

\(\Leftrightarrow x=8\)

\(b.\)\(9^{x-1}=9\)

\(\Leftrightarrow9^x:9=9\)

\(\Leftrightarrow9^x=81\)

\(\Leftrightarrow9^x=9^2\)

\(\Leftrightarrow x=2\)

\(c.\)\(\left|x-5\right|=7-\left(-3\right)\)

\(\Leftrightarrow\left|x-5\right|=7+3\)

\(\Leftrightarrow\left|x-5\right|=10\)

\(\Leftrightarrow\orbr{\begin{cases}x-5=10\\x-5=-10\end{cases}}\)

\(\Leftrightarrow\orbr{\begin{cases}x=15\\x=-5\end{cases}}\)

\(d.\)\(\left|x-5\right|=\left|-7\right|\)

\(\Leftrightarrow\left|x-5\right|=7\)

\(\Leftrightarrow\orbr{\begin{cases}x-5=7\\x-5=-7\end{cases}}\)

\(\Leftrightarrow\orbr{\begin{cases}x=12\\x=-2\end{cases}}\)

\(e.\)\(\left|x\right|-5=3\)

\(\Leftrightarrow\left|x\right|=8\)

\(\Leftrightarrow\orbr{\begin{cases}x=8\\x=-8\end{cases}}\)

\(g.\)\(15-2\left|x\right|=13\)

\(\Leftrightarrow2\left|x\right|=15-13=2\)

\(\Leftrightarrow\left|x\right|=2:2=1\)

\(\Leftrightarrow\orbr{\begin{cases}x=1\\x=-1\end{cases}}\)

\(h.\)\(\left|x-2\right|=0\)

\(\Leftrightarrow x-2=0\)

\(\Leftrightarrow x=0+2\)

\(\Leftrightarrow x=2\)

\(\text{7x - x = 5}^{21}:5^{19}+3.2^2-7^0\)

\(\text{(7-1)x=5}^2\text{ + 3. 4 - 1}\)

\(\text{6x = 25 + 12 - 1}\)

\(\text{6x = 36}\)

\(\text{ x = 6}\)

a)7.x-x=5²¹ :5¹⁹ +3.2² -7⁰

  x.(7-1)=5²+12-1

  x.6     =36

  x         =36:6=6

b)7.x-2.x=6¹⁷:6¹⁵+44:11

   x.(7-2)=6²+4

  x.5      =40

 x=40:5=8

a) 7x-x=5²¹:5¹⁹+3.2²-7⁰

    6x=25+12-1

    6x=36

      x=36:6

      x=6

Vậy x=6

b) 7x-2x=6¹⁷:6¹⁵+44:11

     5x=36+4

     5x=40 

       x=40:5

       x=8

Vậy x=8

giup minh voi cac ban

x(7-2)=6^2+4

x5=40

x=8

vậy x=8

7x-x=5^21:5^19+3.2^2-7

x(7-1)=5^2+12-7

x6=30

x=5

vậy x=5

nhớ h cho mình

\(7x-2x=6^{17}:6^{15}+44:11\)

\(5x=6^2+4\)

\(5x=36+4\)

\(5x=40\)

\(x=40:5\)

\(x=8\)

\(7x-x=5^{21}:5^{19}+3.2^2-7\)

\(6x=5^2+3.4-7\)

\(6x=25+12-7\)

\(6x=37-7\)

\(6x=30\)

\(x=30:6\)

\(x=5\)