(1-1/2) x (1-1/3) x (1-1/4) x (1-1/5)
=1/2*2/3*3/4*4/5
=1/5.
1-1/2 x 1-1/3 x 1-1/4 x 1-1/5
=> = \(\frac{1}{2}\cdot\frac{1}{3}\cdot\frac{1}{4}\cdot\frac{1}{5}=\frac{1}{120}\)
đúng rồi nha > - <
= 1/2 x 2/3 x 3/4 x 4/5
= \(\frac{1\cdot2\cdot3\cdot4}{2\cdot3\cdot4\cdot5}=\frac{1}{5}\)
xin lỗi nhầm rùi > _ <