(1/2×3+1/3×4+1/4×5) :19/20×2014×+1=2014
1/2*2/3*3/4*...*2013/2014*2014/2015 = ?
Tính A= 1/2 x 2/3 x 3/4 x ... x 2013/2014 x 2014/2015
Tính nhanh
\(\frac{2014+\frac{2013}{2}+\frac{2012}{3}+\frac{2011}{4}+\frac{2010}{5}+...+\frac{2}{2013}+\frac{1}{2014}}{\frac{1}{2}+\frac{1}{3}+\frac{1}{4}+\frac{1}{5}+...+\frac{1}{2012}+\frac{1}{2013}+\frac{1}{2014}}\)
Giải tự luận hộ mình nha!!!!!!!! Mình cảm ơn!!!
Tính: (1*2015+2*2014+3*2013+...+2015*1)/(1*2+2*3+3*4+4*5+...+2015*2016)
Tính hợp lý:
A= 1+3+5+7+.............+2015
B=1+4+7+10+...........+2014
C=1+2+4+8+16+.........+2014
D=1+2-3-4+5+6-7-8+9+...................+197+198-199+200+201
Tính A=\(\frac{2014+\frac{2013}{2}+\frac{2012}{3}+\frac{2011}{4}+...+\frac{2}{2013}+\frac{1}{2014}}{\frac{1}{2}+\frac{1}{3}+\frac{1}{4}+...+\frac{1}{2015}}\)
Ai giúp mk tick lại cho
1+2+3+4+...+2014
1+2+3+4+...+100
2+4+6+8+...+50
3 câu đầu nhé!
1+2+3+4+................+2013+2014=?
Tính nhanh (1/1):2+(1/2):3+1/3:4+...+(1/2012):2013+(1/2013):2014