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tinh tong cua 11,10,9,8,7,6,5,..........,-37,-38
-675 nha ban
Ta có: \(A=\left(a-b\right).\left(a^2+a.b+b\right)^2\)
Hay \(A=\left[5-\left(-6\right)\right]\left[5^2+5.6+\left(-6\right)^2\right]\)
\(\Leftrightarrow A=11.\left[25+30+36\right]\)
\(\Leftrightarrow A=11.91\)
\(\Leftrightarrow A=1001\)
hok tốt!!
Thay a=5; b=-6 vào biểu thức A =(a-b)(a^2+ab+b^2) ta có:
A=[5.(-6)].[5^2+5.(-6)+(-6)^2]
=(-30).[25+(-30)+36]
= (-30) .(-5+36)
=(-30).31
=-930
Nhớ nha
Ta có : \(B=2+2^2+2^3+...+2\)\(^{20}\)
\(B=\left(2+2^2+2^3+2^4\right)+\left(2^5+2^6+2^7+2^8\right)+...+\left(2^{17}+2^{18}+2^{19}+2^{20}\right)\)
\(B=2\left(1+2+2^2+2^3\right)+2^5\left(1+2+2^2+2^3\right)+...+2^{17}\left(1+2+2^2+2^3\right)\)
\(B=2.15+2^5.15+...+2^{17}.15\)
\(B=15\left(2+2^5+...+2^{17}\right)\)\(⋮15\)
Nguyễn Ngô Hương Giang!Can you k for me!
\(A=\left(2^1+2^2+2^3+2^4\right)+....+\left(2^{97}+2^{98}+2^{99}+2^{100}\right)+1\)
\(=2.15+2^5.15+...+2^{97}.15+1=15.\left(2+2^5+...+2^{97}\right)+1\)
A 15 dư 1
b ) l - 18 l : 6 - l 15 l : 3
= 18 : 6 - 15 : 3
= 3 - 5
= - 2
\(A=-1500-\left\{5^3.2^3-11.\left[7^2-5.2^3+8\left(11^2-121\right)\right]\right\}.\left(-2\right)\)
\(A=-1500-\left\{\left(10\right)^3-11\left[49-40+8.0\right]\right\}\left(-2\right)\)
\(A=-1500-\left\{1000-11.9\right\}\left(-2\right)\)
\(A=-1500-\left(901\right)\left(-2\right)\)
\(A=-1500+1802\)
\(A=302\)
vậy \(A=302\)
A=\(1+2^1+2^2+2^3+2^4+...+2^{2015}\)
2A=\(2^1+2^2+2^3+2^4+...+2^{2015}+2^{2016}\)
2A-A=\(2^{2016}-1\)
Vậy A=\(2^{2016}-1\)
\(A=1+2^1+2^2+2^3+....+2^{2015}\)
\(2A=2\left(1+2+2^2+.....+2^{2015}\right)\)
\(2A=2+2^2+2^3+....+2^{2016}\)
\(2A-A=\left(2+2^2+.....+2^{2016}\right)-1-2-2^2-...-2^{2015}\)
\(A=2^{2016}-1\)
Vậy\(A=---\)