tim x
x+(x+1)+(x+2)+....+(x+2010)=2029099
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Xét: \(1+2+3+.....+2010\) là dãy số tự nhiên cách đều
Tổng bằng:
\(\dfrac{\left(2010+1\right)\times\left[\left(2010-1\right):1+1\right]}{2}=\dfrac{2011\times2010}{2}=\dfrac{4042110}{2}=2021055\)(1)
x+(x+1)+(x+2)+...+(x+2010)=2029099
= (x+0)+(x+1)+(x+2)+...+(x+2010)=2029099
= (x+x+x+...+x)+(0+1+2+3+...+2010)=2029099
\(\downarrow\)
có (2010-0):1+1=2011 số x
0+1+2+3+...+2010=(2010+0).2011:2=2021055
= x2011 + 2021055 = 2029099
= x2011 = 2029099 - 2021055
= x2011 = 8044
= x = 8044 : 2011
= x = 4 \(\in\)N
Vậy x = 4
a)2+4+6+..+2x=210
=>2*1+2*2+...+2*x=210
=>2(1+2+3+...+x)=210
=>2[x(x+1)/2]=210
=>x*(x+1)=210
hay x*(x+1)=14(14+1)
vậy x=14
c)x+(x+1)+(x+2)+...+(x+2010)
=>(x+x+x+...+x)+(1+2+3+...+2010)=2029099
=>2011x + 2021055 =2029099
2011x =2029099-2021055
2011x =8044
x =8044 /2011
x =4
k cho mình nhé
a)
\(x+\left(x+1\right)+\left(x+2\right)+...+\left(x+2010\right)=2029099\\ 2011.x+\left(1+2+3+...+2010\right)=2029099\\ 2011.x+2021055=2029099\\ 2011.x=2029099-2021055\\ 2011.x=8044\\ x=8044:2011\\ x=4\)
b)
\(2+4+6+...+2x=210\\ 2.\left(1+2+3+...+x\right)=210\\ 1+2+3+...+x=210:2\\ 1+2+3+...+x=105\\ \dfrac{x.\left(x+1\right)}{2}=105\\ x.\left(x+1\right)=105.2\\ x\left(x+1\right)=210\\ x.\left(x+1\right)=14.15\\\Rightarrow x=14\)
a) x+(x+1)+(x+2)+...+(x+2010)=2029099
x+x+1+x+2+...+x+2010=2029099
2011x+[(2010+1).2010:2]=2029099
2011x+2021055=2029099
2011x=2029099-2021055
2011x=8044
x=8044:2011
x=4
Vậy x=4.
b) 2+4+6+8+...+2x=210
(2x+2)*14:2=210
(2x+2)*7=210
2x+2=210:7
2x+2=30
2x=30-2
2x=28
x=28:2
x=14
Vậy x=14.
x + (x+1) +(x+2) +......+ (x+2010)=2029099
=> (x+x+....+x) + (1+2+3+.....+2010)=2029099
=> 2011x + 2021055 = 2029099
=> 2011x=8044
=> x = 4
*** k mk nha!
\(x+\left(x+1\right)+\left(x+2\right)+..+\left(x+2020\right)=2029099\)
\(\Leftrightarrow x+x+1+x+2+...+x+2010=2029099\)
\(\Leftrightarrow\left(x+x+x+...+x\right)+\left(1+2+..+2010\right)=2029099\)
\(\Leftrightarrow\left(x+x+x+...+x\right)+\left\{\frac{\left(2010+1\right).\left[\left(2010-1\right):1+1\right]}{2}\right\}=2029099\)
\(\Leftrightarrow2011x+2021055=2029099\)
\(\Leftrightarrow2011x=8044\)
\(\Leftrightarrow x=4\)
Vậy \(x=4\)
Giải:
\(x+\left(x+1\right)+\left(x+2\right)+...+\left(x+2010\right)=2029099\)
\(\Leftrightarrow x+x+1+x+2+...+x+2010=2029099\)
\(\Leftrightarrow\left(x+x+x+...+x\right)+\left(1+2+3+...+2010\right)=2029099\)
\(\Leftrightarrow2011x+\dfrac{\left(2010+1\right).2010}{2}=2029099\)
\(\Leftrightarrow2011x+2021055=2029099\)
\(\Leftrightarrow2011x=2029099-2021055\)
\(\Leftrightarrow2011x=8044\)
\(\Leftrightarrow x=\dfrac{8044}{2011}=4\)
Vậy \(x=4\).
Chúc bạn học tốt!
a) x+(x+1)(x+2)+....+(x+2010)=2029099
( x + x + x + ... + x ) + ( 1 + 2 + .... + 2010 ) = 2029099
2011x + 2021055 = 2029099
2011x = 2029099 - 2021055
2011x = 8044
x = 8044 : 2011
x = 4
vậy x = 4
x + ( x + 1 ) + ( x + 2 ) + .... + ( x + 2010 ) = 2029099
x . 2011 + ( 1 + 2 + ... + 2010 ) = 2029099
x . 2011 + 2021055 = 2029099
x . 2011 = 2029099 - 2021055
x . 2011 = 8044
x = 8044 : 2011
x = 4
x+(x+1)+(x+2)+...+(x+2010)=2029099
x+x+1+x+2+...+x+2010=2029099
2011x+(1+2+3+..+2010)=2029099
2011x+[(2010+1).2010:2]=2029099
2011x+(2011.2010:2)=2029099
2011x+2021055=2029099
2011x=2029099-2021055
2011x=8044
x=8044:2011
x=4
x + ( x + 1 ) + ( x + 2 ) + ... + ( x + 2010 ) = 2029099
=> ( x + x + x + ... + x ) + ( 1 + 2 + ... + 2010 ) = 2029099
=> 2011x + 2021055 = 2029099
=> 2011x = 2029099 - 2021055
=> 2011x = 8044
=> x = 8044 : 2011
=> x = 4
Chúc bạn học tốt nha !!!
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