\(x+x+1+x+2+...+x+2009=2009\cdot3015\)
\(\Rightarrow2010x+\frac{2009\cdot2010}{2}=2009\cdot3015\)
\(\Rightarrow2010x+2009\cdot2010=2009\cdot6030\)
\(\Rightarrow2010\left(x+2009\right)=12114270\)
\(\Rightarrow x+2009=6027\)
\(\Rightarrow x=4018\)
Tìm x:
a) x + (x+1) + (x+2) +...+ (x+2010)= 2029099
b) 2 + 4 + 6 + 8 +...+ 2x = 210
2) So Sánh:
a)\(A=\frac{2009^{2008+1}}{2009^{2009+1}}vàB=\frac{2009^{2009+1}}{2009^{2010+1}}\)
b) C= 1.3.5.....99 với \(D=\frac{51}{2}.\frac{52}{2}.\frac{53}{2}.....\frac{100}{2}\)
tìm x
x + ( x + 1 ) + ( x + 2 ) + ( x +3 ) + .......... + ( x + 2009 ) = 2009 . 2010
a,x+(x+1)+(x+2)+.....+2008+2009=2009
b,x+(x+1)+(x+2)+....=208+209=209
a,x+=(x+1)+(x+2)+...2008+2009+2009
b,-50-(25+x)=70
tính giá trị biểu thức E =x^10-2009. x^4 - 2009. x^8- .... - 2009.x -1 biết x=2010
Tìm x thỏa mãn: x + (x + 1) + (x + 2) + … + 2009 + 2010 = 2010 A.-2010 B.-2008 C.0 D.-2009
Tìm XEZ biết
a)x+(x+1)+(x+2)+........+2008=2008
b)2009+2008+2007+........+(x+1)+x=2009
A=1+1/3+1/5+1/7+........+1/99
B=1/2+1/2^3+1/2^4+........+2^100
3)tìm x
1/5x8+1/8x11+1/11x14+.......+X(X+3)=1 VÀ 1991/1943
1+5+9+13+17+..............+X=5050
5)CMR;A=2009+2009^2+2009^3+2009+^4+........+2009^10 CHIA HẾT CHO 2010
GIÚP NHNH NHÉ TUI SẼ TICK CHO 3 CHIẾC
Bai 1.Tim x, y biet :
2x(3y-2)+(3y-2) = -55
Bai 2 .a) So sanh : -22/45 va -51/103
b) So sanh A = 2009^2009 +1 / 2009^2010 va B = 2009^2010-2/2009^2011-2
Bai 3 :
a)Tim so tu nhien co 3 chu so , biet rang khi chia so do cho cac so 25, 28,35thi duoc cac so du lan luot la 5,8,15
b)Tim x: (x+1)+(x+2)+(x+3)+...+(x+100)=205550