Question

giúp em 2 bài ạ! 

Answer 1

giúo em với ạ

Answer 2

Bài 1:

a) \(A=\left(3^2.5^2.2^5\right):\left(2^3.3^2\right)=\left[2^3.3^2\left(5^2.2^2\right)\right]:2^3.3^2=5^2.2^2=25.4=100\)

b) \(B=94.12+2.6.5+12=94.12+12.5+12=12\left(94+5+1\right)=12.100=1200\)

Bài 2:

a) \(720:\left(41-x\right)=2^3.5\)

\(\Rightarrow720:\left(41-x\right)=40\)

\(\Rightarrow41-x=720:40=18\Rightarrow x=41-18=23\)

b) \(5^3.5^{x-2}=25^2\)

\(\Rightarrow5^{x-2+3}=25^2\Rightarrow5^{x+1}=5^4\)

\(\Rightarrow x+1=4\Rightarrow x=3\)