Question

Tìm x biết

a/x+(x+1)+(x+2)+...+(x+2010)=2029099

b/5x-14=x+34

c/(x+5) .(x+9) =0

Answer 1

a) x+(x+1)+(x+2)+...+(x+2010)=2029099

<=>2011x+(1+2+3+...+2010)=2029099

<=>2011x+2021055=2029099

<=>2011x = 8044 <=> =4

b) 5x-14=x+34

<=> 5x-x = 34+14

<=> 4x = 48 => x = 12

c) (x+5) .(x+9) =0 <=>

x+5 = 0 --> x = -5 

hoặc x+9 = 0 --> x = -9

 

Answer 2

a/ x=4

b/ x=12

c/ x=-5 hoặc x=-9

Answer 3

<=>x+x+1+x+2+........+x+2010=2029009

<=>(x+x+x+....+x)+(1+2+3+...+2010)=2029099

<=>100x+2021055=2029099

<=>100x=8044

<=>x=4 

vậy x=4