= 6 nha bạn

MSG:54

18/27 = 36/54

2/6 =     18/54

              54/54 = 1

sorry = 1/3

(x+2)⁷=(x+2)⁶

(x+2).(x+2)⁶=(x+2)⁶

(x+2).(x+2)⁶-(x+2)⁶=0

(x+2)⁶.(x+2-1) = 0

(x+2)⁶=0 hoặc x+1=0

x=-2 hoặc x=-1

Vậy x thuộc {-1; 0}

`2/9 + 6/27 + 8/36 + 12/54 + 16/72 + 18/81`

`= 2/9 + 2/9 + 2/9 + 2/9 + 2/9 + 2/9`

`= 2/9 xx 6`

`= 12/9 = 4/3`

\(\frac{3^8.20^5}{6^8.10^2}=\frac{3^8.2^{10}.5^5}{2^8.3^8.2^2.5^2}=5^3=125\)

\(\frac{3^8.20^8}{6^8.10^{10}}=\frac{3^8.\left(5.2^2\right)^5}{\left(3.2\right)^8.\left(2.5\right)^{10}}\)=\(\frac{3^8.5^5.2^{10}}{3^8.2^8.2^{10}.5^{10}}=\frac{1}{2^8.5^5}\)= \(\frac{1}{800000}\)

\(\frac{3^8.20^5}{6^8.10^2}=\frac{3^8.\left(2.10\right)^5}{\left(2.3\right)^8.10^2}=\frac{3^8.2^5.10^5}{2^8.3^8.10^2}=\frac{10^3}{2^3}=\frac{1000}{8}=125\)

giúp mình với

A)18/27

A

Gọi x,y,z là những phân số tối giản cần tìm 

Theo bài ra ta có: 

\(x:y:z=\dfrac{2}{5}:\dfrac{3}{4}:\dfrac{5}{6}=24:45:50\)

\(\Rightarrow\dfrac{x}{24}=\dfrac{y}{45}=\dfrac{z}{50}\)

Áp dụng tính chất dãy tỉ số bằng nhau:

\(\dfrac{x+y+z}{24+45+50}=\dfrac{187}{60}:119=\dfrac{11}{420}\)

\(\Rightarrow\left\{{}\begin{matrix}x=\dfrac{22}{35}\\y=\dfrac{33}{28}\\z=\dfrac{55}{42}\end{matrix}\right.\)

cảm ơn hương nhiều nha

=7*2*(3-1)+27:(18-5)-6

=14*2 +27:(18-5)-6

=28+27=55:(18-5)-6

=55:13-6=55:7

=7 du 6