M×9/16=27/8

M=27/8÷9/16

M=6

4/9÷m=2/27

M=4/9÷2/27

M=6

mink cũng hổng có  biết làm

a)

\(9^{16-x}=27^{x+4}\\ \Leftrightarrow3^{2.\left(16-x\right)}=3^{3.\left(x+4\right)}\\ \Leftrightarrow2.\left(16-x\right)=3.\left(x+4\right)\\ \Leftrightarrow32-2x-3x-12=0\\ \Leftrightarrow-5x=-20\Leftrightarrow x=4\)

b)

\(16^{x-2}=0,25.2^{-x+4}\\ \Leftrightarrow2^{4\left(x-2\right)}=0,25.2^{-x+4}\\ \Leftrightarrow2^{4x-8+x-4}=0,25\\ \Leftrightarrow2^{5x-12}=0,25\Leftrightarrow5x-12=\log_20,25\\ \Leftrightarrow5x-12=-2\\ \Leftrightarrow x=2\)

2/3 x 4/5 + 4/5 x 8/3 = 4/5 x (2/3 + 8/3) = 4/5 x 10/3 = 8/3

27/32 x 16/9 -27/32 x7/9 + 27/32 

= 27/32 x (16/9 - 7/9 + 1 )

=27/32 x 2 

=27/16

\(\frac{2}{3}\) x   \(\frac{4}{5}\) +    \(\frac{4}{5}\) x     \(\frac{8}{3}\)

=\(\frac{4}{5}\) x    ( \(\frac{2}{3}\) +    \(\frac{8}{3}\) )

= \(\frac{4}{5}\) x    \(\frac{10}{3}\)

= \(\frac{40}{15}\) = \(\frac{8}{5}\)

lỗi

x + 4/9 + 8/18 + 12/27 + 16/36 = 16/9

 x + (4/9+12/27)+(8/12+16/36) = 16/9

 x +       8/9         +     10/9        = 16/9

  x +               2                         = 16/9

  x                                              = 16/9 - 2

  x                                               =  -2/18  

x+4/9+4/9+4/9+4/9=16/9
x+4/9.4=16/9
x+16/9=16/9
-->    x = 0

\(\left(\dfrac{9}{16}\right)^5\cdot x=\left(\dfrac{27}{64}\right)^3\)

\(\Leftrightarrow\left(\dfrac{3}{4}\right)^{10}\cdot x=\left(\dfrac{3}{4}\right)^9\)

\(\Rightarrow x=\left(\dfrac{3}{4}\right)^9:\left(\dfrac{3}{4}\right)^{10}\)

\(\Rightarrow x=\left(\dfrac{3}{4}\right)^{-1}\)

\(\Rightarrow x=\dfrac{4}{3}\)

Vậy x=4/3

(\(\dfrac{9}{16}\))⁵\(\times\) \(x\) = (\(\dfrac{27}{64}\))³

             \(x\) = (\(\dfrac{27}{64}\))³ : (\(\dfrac{9}{16}\))⁵

             \(x\)  = (\(\dfrac{3^3}{2^6}\))³: (\(\dfrac{3^2}{2^4}\))⁵

             \(x\)  = \(\dfrac{3^9}{2^{18}}\) : \(\dfrac{3^{10}}{2^{20}}\)

             \(x\)  = \(\dfrac{3^9}{2^{18}}\) \(\times\) \(\dfrac{2^{20}}{3^{10}}\)

             \(x\) = \(\dfrac{2^2}{3}\)

             \(x\) = \(\dfrac{4}{3}\)

(9/16)^5×x=(27/64)^3

(3/4)^10×x=(3/4)^9

X=(3/4)^9÷(3/4)^10

X=(3/4)^-1

X=4/3

( 123 . 456 - 23 . 16 ) . ( 12 . 9 - 4 . 27)

= ( 56088 - 368) . ( 108 - 108 )

= 55720 . 0

= 0

( 123 x 456 - 23 x 16 ) x ( 12 x 9 -4 x 27 )

=( 123 x 456 - 23 x 16 ) x (108 -108)

=( 123 x 456 - 23 x 16 ) x 0=0

( 123 x 456 - 23 x 16 ) x ( 12 x9 - 4 x 27 )  = ( 123 x 456 - 23 x 16 ) ( x 108 - 108 ) 

                                                               =  557 / 0 

                                                               = 0

Chúc bạn học tốt Kane thân mến ! 

X Chỉ có thể là 0

\(\dfrac{16}{27}xX=\dfrac{10}{27}-\dfrac{6}{27}\)

\(\dfrac{16}{27}xX=\dfrac{4}{27}\)

\(X=\dfrac{4}{27}:\dfrac{16}{27}\)

X=\(\dfrac{1}{4}\)

16/27x X+2/9=10/27

16/27x X=10/27-2/9

16/27x X=4/27

X=4/27:16/27

X=1/4