1/2-1/3+1/3-1/4+....+1/9-1/10
Ta có 1/2-1/10=2/5
1/2x3 + 1/3x4 + 1/4x5 + 1/5x6 + 1/ 6x7 + 1/7x8 + 1/8x9 + 1/9x10
= 2/5
Tính:
1/2x3 + 1/3x4+ 1/4x5+ ......+1/9x10
1/1x2 + 1/2x3 + 1/3x4 + 1/4x5 +............. + 1/9x10
bài làm đầy đủ
\(\frac{1}{2x3}+\frac{1}{3x4}+\frac{1}{4x5}+...........+\frac{1}{9x10}\)
\(\frac{1}{1x2}+\frac{1}{2x3}+\frac{1}{3x4}+\frac{1}{4x5}+\frac{1}{5x6}+\frac{1}{6x7}+\frac{1}{7x8}+\frac{1}{8x9}+\frac{1}{9x10}\)
a)1,27+2,77+4,27+5,77+...+31,27+32,77
b)1/1x2+1/2x3+1/3x4+1/4x5+1/5x6+1/6x7+1/7x8 +1/8x9+1/9x10
mình cần gấp
tinh nhanh
1x2+2x3+3x4+4x5+......+9x10=?
jup toi giai bai nay voi 1x2+2x3+3x4+4x5+......+9x10
1/1x2+1/2x3+1/3x4+.....+1/9x10
1/1x2+1/2x3+1/3x4+...+1/9x10
