Các câu hỏi tương tự
tính nhanh
1/2x3 + 1/3x4 + 1/4x5 + 1/5x6 + 1/6x7
1/2x3 + 1/3x4 + 1/4x5 + 1/5x6 + 1/6x7 + 1/20x21
1/1x2 + 1/2x3 +1/3x4 +1/4x5 +1/5x6
1\2x3+1\3x4+1\4x5+1\5x6
1/2x3 + 1/3x4 + 1/4x5...+ 1/9x10
1/ 2x3+ 1/ 3x4+ 1/ 4x5.....+ 1/ 9x10 =
1/2x3+1/3x4+1/4x5+...+1/ax(a+1)
☹ 1/ 2x3 + 1/ 3x4 + 1/ 4x5 + 1/ 5x6 ☹ giúp mk
A = 1/2x3 + 1/3x4 + 1/4x5 + 1/5x6 + 1/6x7 + 1/7x8
1/2x3 + 1/3x4 + 1/4x5 + 1/5x6 +1/6x7 +...1/10x11 =?