Rút gọn phân số 
$\frac{1.2.3+2.4.6+3.6.9+5.10.15}{1.3.6+2.6.12+3.9.18+15.5.30}$ 
tử n' có dạng là a.2a.3a đạt 6 ra ngoài mẫu có dạng a.3a.6a đặt 18 ra ngoài rút gọn ra 1/3 –  ❄⊰๖ۣۜNgốc๖ۣۜ ⊱ ❄ 05-01-17 03:11 AM
Sử dụng máy tính casio ta được kết quả =161/486 –  khanhsd0901 04-01-17 03:35 AM
đề khó hiểu quá –  khanhsd0901 04-01-17 12:49 AM

Câu hỏi này được treo giải thưởng trị giá +1000 vỏ sò bởi nguyenvietthang3805@gmail.com, đã hết hạn vào lúc 04-01-17 11:54 PM

ewrwe

Đặt A =\frac{1.2.3 + 2.4.6 + 3.6.9 + 5.10.15}{1.3.6 + 2.6.12 + 3.9.18 + 5.15.30}
      A = \frac{1.2.3(1 + 2 + 3 + 5}{1.3.6(1 + 2 + 3 + 5}
      A = \frac{2}{6}
      A = \frac{1}{3}
Ta có: $\frac{1.2.3+2.4.6+3.6.9+5.10.15}{1.3.6+2.6.12+3.9.18+5.15.30}$
$=\frac{6.(1^3+2^3+3^3+5^3)}{18.(1^3+2^3+3^3+5^3)}$
$=\frac{1}{3}$
Vậy........
~~~~$Amen$~~~~
Đúng thì click V cho chị nhá !!!
Oắn tùng bh :v –  ❄⊰๖ۣۜNgốc๖ۣۜ ⊱ ❄ 05-01-17 05:46 AM
đừng click b ơi,chỉ tick cho c ấy thôi –  ๖ۣۜTQT☾♋☽ 05-01-17 04:16 AM

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