	Miin-Blink_Army \| Chat Online
	18/02/2021 13:01:29
	Toán học - Lớp 6 \| Toán học \| Lớp 6

13.15.19

Tính nhanh B=6/1.3.7+6/3.7.9+6/7.9.13+6/9.13.15+6/13.15.19
C= 1/1.3.7+1/3.7.9+1/7.9.13+1/9.13.15+1/13.15.19
D= 1/2.4.6 +1/4.6.8+1/6.8.10+1/8.10.12 +...+1/96.98.100
E= 5/1.5.8 +5/5.8.12+5/8.12.15 +...+ 5/33.36.40