Các câu hỏi tương tự
c = 2 /1x2 + 2/2x3 +2/3x4 +2/4x5 +2/5x6 + 2/6x7
s=1x2+2x3+3x4+4x5+5x6
Tính nhanh tổng sau :
1/1x2 + 1/2x3 + 1/3x4 + 1/4x5 + 1/5x6 + 1/6x7
ai nhanh mình tích cho mình cần gấp đó
tính nhanh 2/2x3 +2/3x4 +2/4x5 +2/5x6 +2/6x7
\(A=\frac{5}{1x2}+\frac{5}{2x3}+\frac{5}{3x4}+\frac{5}{4x5}+\frac{5}{5x6}+\frac{5}{6x7}+\frac{5}{7x8}\)
Ai nhanh mk tick nha!
\(\frac{1}{1x2}+\frac{1}{2x3}+\frac{1}{3x4}+\frac{1}{4x5}+\frac{1}{5x6}+\frac{1}{6x7}+\frac{1}{7x8}+\frac{1}{8x9}+\frac{1}{9x10}\)
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
a.1x2+2x3+3x4+.........+19x20
b. 3x4+4x5+5x6+.........+49x50
Tính : 1/1x2 + 1/2x3 + 1/3x4 + 1/4x5 + 1/5x6