1/3*4+1/4*5+1/5*6+...1/11x 12= 1/3-1/4+1/4-1/5+1/5-1/6+...+1/11-1/12
=1/3-1/12
=4/12-1/12
=3/12=1/4
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Các câu hỏi tương tự
1/3x4 + 1/4x5 + 1/5x6 + ...........+ 1/11x12
1/3x4 + 1/4x5 + 1/5x6 + .........+ 1/11x12 =
tính 1/3x4+1/4x5+1/5x6+............+1/11x12= ?
Tính 1/3x4+1/4x5+1/5x6+1/6x7+1/7x8+1/8x9+1/9x10+1/10x11+1/11x12
\(\frac{1}{3x4}\)+ \(\frac{1}{4x5}\) + \(\frac{1}{5x6}\) + \(\frac{1}{6x7}\)+ ............. + \(\frac{1}{11x12}\) = ?
\(\frac{1}{3x4}\) + \(\frac{1}{4x5}\) + \(\frac{1}{5x6}\) + \(\frac{1}{6x7}\)+.........+\(\frac{1}{11x12}\)
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+1/3x4+1/4x5+1/5x6
Tính nhanh:
1+1/3x4+1/4x5+1/5x6