\(8.5+8.5-8.5+8.5\)

\(=8.\left(5+5-5+5\right)\)

\(=8.10\)

\(=80\)

8.5+8.5-8.5+8.5=17

= 17 

Nhớ tích 

Chữa lại : 

\(\left(8,25\times3\right)+\left(8,5\times2\right)+8,30\)

= \(24,75+17+16,4\)

\(=41,75+16,4=58,15\)

Tk mk mk tk lại ! ^^ 

99,3 là đúng

99,3 đấy mk chắc chắn 

ai k giùm mk với năn nỉ mọi người

\(\frac{3^8.5^9+15^8.3^2}{15^9.3^3-3^8.5^9}\)

\(=\frac{3^8.5^9+5^8.3^{10}}{5^9.3^{12}-3^8.5^9}\)

\(=\frac{3^8.5^8.\left(5+3^2\right)}{5^9.3^8.\left(3^4-1\right)}=\frac{14}{80}=\frac{7}{40}\)

\(=\frac{15^8.5+15^8.3^2}{15^8.5.3.3^3-15^8.5}\)

\(=\frac{15^8\left(5+9\right)}{15^8\left(5.3^4-5\right)}\)

\(=\frac{15^8.14}{15^8.400}\)

\(=\frac{14}{400}\)

\(=\frac{7}{200}\)

\(\frac{3^8\cdot5+15^8\cdot3^2}{15^9\cdot3^3-3^8\cdot5^9}\)

\(=\frac{3^8\cdot5^9+5^8\cdot3^9}{5^9\cdot3^3-3^8\cdot5^9}\)

\(=\frac{3^8\cdot5^8\left(5+3^2\right)}{5^9\cdot3^8\cdot\left(3^4-1\right)}\)

\(=\frac{14}{80}=\frac{7}{40}\)

8,5 + 6,5 = 15

=5x(6+8)=5x14=70

8,5+6,5=15 k nha!

Theo bài ra , ta có : 

\(8.5^{2n}=200\)

\(\Rightarrow5^{2n}=25\)

\(\Rightarrow5^{2n}=5^2\)

\(\Rightarrow2n=2\)

\(\Rightarrow n=1\)

Vậy \(n=1\)

0,85 N vì 1 N = 1 kg

\(\dfrac{36^4\cdot125}{2^8\cdot5^4\cdot3^6}=\dfrac{2^8\cdot3^8\cdot5^3}{2^8\cdot5^4\cdot3^6}=3^2\cdot\dfrac{1}{5}=\dfrac{9}{5}\)

= ( 2^2 . 3^2)^4 . 5 ^ 3 / 2^8.5^4.3^6

= 2^8 . 3^8 . 5^3 / 2^8 . 5^4 . 3^6

=3^2/5

= 9/5

Chúc bạn học tốt ^^ !!