bạn chỉ cho mình các bước đc k

Đã gõ

   (a:a x a:1 - a x 1) x ( 1 + 2 + 3 + 4 +...+ 10)

= (1 x a - a ) x ( 1 + 2 + 3 + 4 +...+ 10)

= (a - a) x ( 1 + 2 +...+ 10)

= 0 x (1 + 2 +...+ 10)

= 0

A=2+2^2+2^3+....+2^10:3

A=(2+2^2)+(2^3+2^4)+....+(2^9+2^10):3

A=2.(1+2)+2^3.(1+2)+...+2^9.(1+2):3

A=2.3+2^3.3+...+2^9.3:3

A=3.(2+2^3+...+2^9):3

vậy A:3 

a/ Theo tính chất dãy tỉ số bằng nhau,ta có:

a/2=b/3=c/4=a+b-c/2+3-4=20/1=20

Do đó:

a/2=20 suy ra a=20.2=40

b/3=20 suy ra b=20.3=60

c/4=20 suy ra c=20.4=80

Vậy a=40, b=60 và c=80

b/ Tương tự

\(3^5\cdot3^2\cdot3=3^{\left(5+2+1\right)}=3^8\)

\(16^4:4^2=\left(4^2\right)^4:4^2=4^8:4^2=4^6\)

\(2^5:16=2^5:2^4=2\)

\(4^2:2^4=\left(2^2\right)^2:2^4=\frac{2^4}{2^4}=1\)

\(3^5.3^2.3=3^7.3=3^8\)

\(16^4:4^2=16^4:16=16^3\)

\(a:a=19:17=\frac{19}{17}\)

\(2^5:16=2^5:2^4=2\)

\(4^4:2^4=\left(2^2\right)^4:2^4=2^6:2^4=2^2=4\)

\(3^5\cdot3^2\cdot3=3^{5+2+1}=3^8=6561\)

\(16^4:4^2=16^4:16=16^{4-1}=16^3=4096\)

ko hiểu đề

\(2^5:16=2^5:2^4=2^{5-4}=2^1=2\)

\(4^4:2^4=\left(2^2\right)^4:2^4=2^8:2^4=2^{8-4}=2^4=16\)

hok tốt...