16^x = 128⁴ = > ( 2⁴ )^x = ( 2⁷)⁴ = > 2^4x = 2²⁸ = > 4x =28= > x= 7

\(16^x=128^4=>\left(2^4\right)^x=\left(2^7\right)^4=>2^{4x}=2^{28}=>4x=28=>x=7\)

vậy x=7

tick nhé

         A =    \(\dfrac{1}{2}\) + \(\dfrac{1}{4}\) + \(\dfrac{1}{8}\) + \(\dfrac{1}{16}\)+ \(\dfrac{1}{32}\)+\(\dfrac{1}{64}\)+\(\dfrac{1}{128}\)

A\(\times\) 2 =  1 + \(\dfrac{1}{2}\) + \(\dfrac{1}{4}\) + \(\dfrac{1}{8}\) + \(\dfrac{1}{16}\)+ \(\dfrac{1}{32}\)+ \(\dfrac{1}{64}\) 

A \(\times\) 2 - A = 1 - \(\dfrac{1}{128}\)

A\(\times\)(2-1) = \(\dfrac{128-1}{128}\)

A           = \(\dfrac{127}{128}\)

Gọi \(\dfrac{1}{2}+\dfrac{1}{4}+\dfrac{1}{8}+\dfrac{1}{16}+\dfrac{1}{32}+\dfrac{1}{64}+\dfrac{1}{128}\) là B

\(B=\dfrac{1}{2}+\dfrac{1}{4}+\dfrac{1}{8}+\dfrac{1}{16}+\dfrac{1}{32}+\dfrac{1}{64}+\dfrac{1}{128}\)

\(2\cdot B=1+\dfrac{1}{2}+\dfrac{1}{4}+\dfrac{1}{8}+\dfrac{1}{12}+\dfrac{1}{32}+\dfrac{1}{64}\)

\(2\cdot B-B=1+\dfrac{1}{2}+\dfrac{1}{4}+\dfrac{1}{8}+\dfrac{1}{12}+\dfrac{1}{32}+\dfrac{1}{64}-\left(\dfrac{1}{2}+\dfrac{1}{4}+\dfrac{1}{8}+\dfrac{1}{16}+\dfrac{1}{32}+\dfrac{1}{64}+\dfrac{1}{128}\right)\)

\(B=1+\left(\dfrac{1}{2}-\dfrac{1}{2}+\dfrac{1}{4}-\dfrac{1}{4}+.....+\dfrac{1}{64}-\dfrac{1}{64}\right)-\dfrac{1}{128}\)

\(B=1+0-\dfrac{1}{128}\)

\(B=1-\dfrac{1}{128}\)

\(B=\dfrac{128}{128}-\dfrac{1}{128}\)

\(B=\dfrac{127}{128}\)

4 nhé bạn         

256 k cho mk nha

Số cần tìm là :

    128+128=256 

              Đs: 256

256 nha bn!

Cho mk 1 L-I-K-E nha! (^_^)

1/128+2/128+4/128+8/128+16/128+32/128+64/128=127/128

 k di

óc chó

\(\frac{1}{4}+\frac{1}{8}+\frac{1}{16}+\frac{1}{32}+\frac{1}{64}+\frac{1}{128}\)đề là như vậy mới đúng

=\(1-\frac{1}{4}+\frac{1}{4}-\frac{1}{8}+\frac{1}{8}-\frac{1}{16}+\frac{1}{16}-\frac{1}{32}+\frac{1}{32}-\frac{1}{64}+\frac{1}{64}+\frac{1}{128}\)

=\(1-\frac{1}{128}=\frac{127}{128}\)

A = 2014 x ( 128 x 68 - 64 x 136 ) + 2015 

A = 2014 x 0 + 2015 

A = 0 + 2015 

A = 2015 

Chúc bạn học tốt ! 

= 2014 x (  8704 - 8704 ) + 2015

= 2014 x 0 + 2015

A = 0 + 2015 = 2015 

= 128/256 + 64/256 + 32/256 + 16/256 + 8/256 + 4/256 + 2/256 + 1/256 

= 255/256

q​uy đ​ồ​ng mẫ​u số​ bạ​n nhé​. Mẫ​u số chung = 256

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#)Giải :

\(\left[\left(-\frac{56}{64}\right)--\left(\frac{1}{9}\div\frac{8}{27}\right)-\frac{1}{3}\right]\div-\frac{81}{128}\)

\(\Leftrightarrow\left[\left(-\frac{7}{8}\right)-\left(-\frac{3}{8}\right)-\frac{1}{3}\right]\div\left(-\frac{81}{128}\right)\)

\(\Leftrightarrow\left(-\frac{5}{6}\right)\div\left(-\frac{81}{128}\right)\)

\(\Leftrightarrow\frac{320}{243}\)

Tham khảo :https://h.vn/hoi-dap/question/692888.html

Hoặc hỏi trên H.vn 

  \(\left[-\frac{54}{64}--\left(\frac{1}{9}:\frac{8}{27}\right):-\frac{1}{3}\right]:-\frac{81}{128}\)

\(=\left[-\frac{54}{64}+\frac{3}{8}:-\frac{1}{3}\right]:-\frac{81}{128}\)

\(=\left[-\frac{54}{64}-\frac{9}{8}\right]:-\frac{81}{128}\)

\(=-\frac{63}{32}:-\frac{81}{128}\)

\(=\frac{28}{9}\)