Tính nhanh: (1/2-1)(1/3-1)(1/4-1)...(1/999-1)
Giải thích
5.18−10.27+15.3610.36−20.54+30.72=5.18−5.18.3+5.18.610.36−10.36.3+10.36.6=5.181−3+610.361−3+6=14
5.18−10.27+15.3610.36−20.54+30.72=5.18−5.18.3+5.18.610.36−10.36.3+10.36.6=5.181−3+610.361−3+6=14