x+(x+1)+...+(x+2009) dãy số trên có:x+2009-x+1=2010 số
=>x+(x+1)+...+(x+2009)=(x+x+2009).2010:2=(2x+2009).1005
=>(2x+2009).1005=2009.2010
<=>2x+2009=2009.2
<=>2x=2009.2-2009
<=>2x=2009
<=>x=2009/2
Tìm x biết: x+(x+1)+(x+2)+(x+3)+....+(x+2009)=2009.2010
X+(X+1)+(x+2)+++++++(x+2009)=2009.2010
x + (x +1)+(x +2)+...+(x +2009)=2009.2010
Giải chi tiết
tìm x
x + ( x + 1 ) + ( x + 2 ) + ( x +3 ) + .......... + ( x + 2009 ) = 2009 . 2010
1.Tìm X thuộc Z:
a) 3.(X-1).(X-5)= -18
b) 5.(x-2) . (x+3)=15
c) X+(X+1)+(X+2)+...+2008+2009=2009
d) 1963+1962+...+(X+1)+X=3925
1.Tìm X thuộc Z:
a) 3.(X-1).(X-5)= -18
b) 5.(x-2) . (x+3)=15
c) X+(X+1)+(X+2)+...+2008+2009=2009
d) 1963+1962+...+(X+1)+X=3925
1.Tìm X thuộc Z:
a) 3.(X-1).(X-5)= -18
b) 5.(x-2) . (x+3)=15
c) X+(X+1)+(X+2)+...+2008+2009=2009
d) 1963+1962+...+(X+1)+X=3925
1.Tìm X thuộc Z:
a) 3.(X-1).(X-5)= -18
b) 5.(x-2) . (x+3)=15
c) X+(X+1)+(X+2)+...+2008+2009=2009
d) 1963+1962+...+(X+1)+X=3925
1.Tìm X thuộc Z:
a) 3.(X-1).(X-5)= -18
b) 5.(x-2) . (x+3)=15
c) X+(X+1)+(X+2)+...+2008+2009=2009
d) 1963+1962+...+(X+1)+X=3925
