Toán Lớp 6: tim x : 2013+2012+…+(x+1)+x+(x-1)=2013
mk dang can gap mn oiw
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Toán Lớp 6: tim x : 2013+2012+…+(x+1)+x+(x-1)=2013
mk dang can gap mn oiw
Comments ( 1 )
2013+2012+…+1+(-1)+3x=2013
2013+2012+…+2+3x=2013
2012+…+2+3x=2013-2013
2012+…+2+3x=0 (có 2011 số hạng; tổng 2011 số hạng = (2012+2)*2011:2=2025077)
2025077+3x=0
3x=0-2025077
3x=-2025077
x=-2025077:3
x=-2025077/3