A. 0,0815

B. 81,5

C. 0,815

D. 8,015

=0,0815

=81,5

=0,815

=8,015

 0,0815

 81,5

 0,815

 8,015

\(\left(81:3^2+4.5^2\right)+1000:10^3\)

\(=\left(3^4:3^2+2^2.5^2\right)+10^3:10^3\)

\(=\left(3^2+10^2\right)+1\)

\(=9+100+1\)

\(=100+10\)

\(=110\)

(81:3^2+4.5^2)+1000:10^3

=(3^4:3^2+2^2.5^2)+10^3:10^3

=9+100+1

=100+10

=110

Lưa ý đấu . là nhân nha !

8⁴.16⁵=2³²

5⁴⁰.125².25³=5⁵²

27⁴.81¹⁰=3⁵²

10³.100⁵.1000⁴=10²⁵

Chúc hk tốt!!!

+) \(8^4\times16^5=\left(2^3\right)^4\times\left(2^4\right)^5=2^{12}\times2^{20}=2^{12+20}=2^{32}\)

+) \(5^{40}\times125^2\times25^3=5^{40}\times\left(5^3\right)^2\times\left(5^2\right)^3=5^{40}\times5^6\times5^6=5^{40+6+6}=5^{52}\)

+) \(27^4\times81^{10}=\left(3^3\right)^4\times\left(3^4\right)^{10}=3^{12}\times3^{40}=3^{12+40}=3^{52}\)

+) \(10^3\times100^5\times1000^4=10^3\times\left(10^2\right)^5\times\left(10^3\right)^4=10^3\times10^{10}\times10^{12}=10^{3+10+12}=10^{25}\)

_Chúc bạn học tốt_

a) \(8^4.16^5\)

\(=\left(2^3\right)^4.\left(2^4\right)^5\\ =2^{3.4}.2^{4.5}\\ =2^{12}.2^{20}\\ =2^{12+20}\\ =2^{32}\)

b) \(5^{40}.125^2.625^3\)

\(=5^{40}.\left(5^3\right)^2.\left(5^4\right)^3\)

\(=5^{40}.5^{3.2}.5^{4.3}\)

\(=5^{40}.5^6.5^{12}\)

\(=5^{40+6+12}\)

\(=5^{58}\)

c) \(27^4.81^{10}\)

\(=\left(3^3\right)^4.\left(3^4\right)^{10}\)

\(=3^{3.4}.3^{4.10}\)

​\(=3^{12}.3^{40}\)​

\(=3^{52}\)

d) \(10^3.100^5.1000^4\)

\(=10^3.\left(10^2\right)^5.\left(10^3\right)^4\)

\(=10^3.10^{2.5}.10^{3.4}\)

\(=10^3.10^{10}.10^{12}\)

\(=10^{3+10+12}\)

\(=10^{25}\)

9=3^2

16=2^4

64=2^6

15=3.5

27=3^3

81=3^4

1000000=1000.10^3=1000.10^3=10.10^5

A

\(5^1.5^3.5^4\)=\(5^{1+3+4}=5^8\)

B

\(10^1.10^2.10^3=10^{1+2+3}=10^6\)

C

\(8^4.16^5.32^1\)

d

\(27^4.81^{10}\)

Thank bạn 

a,

5x125x625

=5x5³x5⁴

=5⁸

tt nhé

Ta có :\(A=\left(5+10+15+...+1000\right).\left\{\frac{2}{5}:0,5+2:\left(-0,4\right)\right\}:\left(\frac{1}{5}+\frac{1}{10}+...+\frac{1}{1000}\right)\)

\(\Leftrightarrow A=\left(5+10+15+...+1000\right).\left\{\frac{2}{5}:\frac{1}{2}+2:\left(-\frac{2}{5}\right)\right\}:\left(\frac{1}{5}+\frac{1}{10}+...+\frac{1}{1000}\right)\)\(\Leftrightarrow A=\left(5+10+15+...+1000\right).\left\{\frac{2}{5}.2+2.\left(-\frac{5}{2}\right)\right\}:\left(\frac{1}{5}+\frac{1}{10}+...+\frac{1}{1000}\right)\)\(\Leftrightarrow A=\left(5+10+...+1000\right).\left\{2.\left(\frac{2}{5}-\frac{5}{2}\right)\right\}.\left(5+10+...+1000\right)\)

\(\Leftrightarrow A=\left(5+10+...+1000\right).\left(5+10+...+1000\right).-\frac{21}{10}\)

Ta có : Số số hạng của dãy số : \(5+10+...+1000\) là :

\(\left(1000-5\right):5+1=200\)

\(\Rightarrow\) Tổng của dãy số : \(5+10+...+1000\) là :

\(\frac{\left(5+1000\right).200}{2}=100500\)

\(\Rightarrow A=100500.100500.\left(-\frac{21}{10}\right)\)

\(\Rightarrow A=100500^2.\left(-\frac{21}{10}\right)\)

\(\Rightarrow A=\frac{100500^2.\left(-21\right)}{10}\)

Vậy :\(A=\frac{100500^2.\left(-21\right)}{10}\)

P/s: Số to quá nên mình đề dưới dạng phân số, không tính ra kết quả cụ thể.

a) 27 × 10 = 270;    72 × 100 = 7200;    14 × 1000 = 14000

86 × 10 = 860;     103 × 10 = 10300;    452 × 1000 = 452000

358 × 10 = 3580;     1977 × 100 = 197700;    300 × 1000 = 300000

b) 80 :10 = 8;     400 : 100 = 4    ;6000 : 1000 = 6

300 : 10 = 30;     4000 : 100 = 40    ; 60000 : 1000 = 60

2000 :10 = 200;     40000 :100 = 400    ;600000 : 1000 = 600

c) 64 × 10 = 640;    32 × 100 = 3200;    95 × 1000 = 95000

640 : 10 = 64;     3200 : 100 = 32;    95000 : 1000 = 95