\(Ta\) \(có:\)
\(A=2^0+2^1+2^2+2^3+...+2^{100}\)
\(=>2A=2+2^2+2^3+...+2^{101}\)
\(=>2A-A=\left(2+2^2+2^3+...+2^{101}\right)-\left(2^0+2^1+2^2+...+2^{100}\right)\)
\(=>A=2^{101}-1\)
\(Mà\) \(B=2^{101}\)
\(=>A< B\)
\(Ta\) \(có:\)
\(A=2^0+2^1+2^2+2^3+...+2^{100}\)
\(=>2A=2+2^2+2^3+...+2^{101}\)
\(=>2A-A=\left(2+2^2+2^3+...+2^{101}\right)-\left(2^0+2^1+2^2+...+2^{100}\right)\)
\(=>A=2^{101}-1\)
\(Mà\) \(B=2^{101}\)
\(=>A< B\)
1, cho a^100+b^100=a^101+b^101=a^101+b^101=a^102+b^102.CM a+b/b=a^2+b^2/a^2b^2
2,tính gtbt:A= x/xy+x+1+y/y+1+yz+z/1+z+xz
3, cho a,b,c,d>0 TM:a^2+b^2=1 và a^4/b+c^4/d=1/b+d CM:a^2016/b^1003+c^2006/d^1003=2/(b+d)^1003
a) 2n-3 chia hết cho n+1 tìm n
b) so sánh
A= 2^0 +2^1 +2^2 +2^3 +.....+2^100 và B= 2^101
Chứng minh rằng:
\(A=\frac{1}{2^2}+\frac{1}{3^2}+\frac{1}{4^2}+...+\frac{1}{100^2}< 1\) \(B=\frac{1}{3}+\frac{2}{3^2}+\frac{3}{3^3}+\frac{4}{3^4}+...+\frac{100}{3^{100}}+\frac{101}{3^{101}}< \frac{3}{4}\)
Cho ham so
f(x)=4^x/4^x+2
Tinh A=f(0)+f(1/101)+f(2/101)+f(3/101)+...+f(100/101)+f(1)
A=1*2+2*3+...+100*101
B=1*3+2*4+...+100*102
Tính B-A= ????????
1) chứng minh: A= 75( 42014 + 42013+ ... + 4 +1 )+ 25 chia hết cho 100
2) cho a,b,c>0. chứng tỏ rằng: \(M=\frac{a}{a+b}+\frac{b}{b+c}+\frac{c}{c+a}\)không là số nguyên
3) Tìm x biết : |x+1/101| + |x+2/101| + |x+3/101|+....+ |x+100/101|=1001x
So sánh
A=20+21+22+23+...+2100
B=2101
Cho A = 1 x 2 + 2 x 3 + 3 x 4 + 4 x 5 + ... + 100 x 101
và B = 1 x 3 + 2 x 4 + 3 x 5 + 4 x 6 + ... + 100 x 102
Vậy B - A = ?
Cho A= 1/2 . 3/4 . 5/6 . ......... . 99/100
B= 2/3 . 4/5 . ......... . 100/101
Chung minh A<B