Question

Tìm x

a) x + (x+1) + (x+2) + (x+3) +.......+ (x+2010) = 20229099

b) 2+4+6+8+.......+2x= 210

 

Answer 1

a x=1

b x=3

Answer 2

a)theo mik là sai đầu bài 

b)2+4+6+8+...+2x=210

2.(1+2+3+...+x)=210

(1+2+3+...+x)=210:2=105

=>x.(x+1):2=105

=>x=14

Vậy x=14

Answer 3

a) x+(x+1)+(x+2)+(x+3)+.....+(x+2010)=20229099

=>x+x+1+x+2+x+3+.....+x+2010=20229099

=>(x+x+...+x) (có 2011 c/s x) +(1+2+3+....+2010)=20229099

=>2011.x+(2010-1):1+1=20229099

=>2011x+(2011+1).2009:2=20229099

=>2011x+2021054=20229099

=>2011x              =20229099-202154

=>2011x              =18280045

=>x             =18280045:2011

=> x            =9

vậy,x=9

Answer 4

a) (x + x + x + ... + x) + (1 + 2 + 3 + ... + 2010) = 20229099

2011x + (1 + 2010) + (2 + 2009) + ... + (1005 + 1006) = 20229099

2011x + 2011 + 2011 + ... + 2011 = 20229099

2011x + 2011.1005 = 20229099

2011x + 2021055 = 20229099

2011x = 20229099 - 2021055

2011x = 18208044

x = 9054,223

Answer 5

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