Tính tổng sau:
1.3+2.4+3.5+4.6+.....+97.99+98.100
1/1.3 - 1/2.4 + 1/3.5 - 1/4.6+.....+1/97.99-1/98.100
S =1/1.3-1/2.4+1/3.5-1/4.6+1/5.7 - 1/6.8+1/7.9-1/8.10
A=2/1.3-2/3.5-2/5.7-...-2/19.21-2/21.23-2/23.25-1/27
Tính tổng: \(S=\frac{1}{1.3}-\frac{1}{2.4}+\frac{1}{3.5}-\frac{1}{4.6}+\frac{1}{5.7}-\frac{1}{6.8}+\frac{1}{7.9}-\frac{1}{8.10}\)
tính
S=\(\dfrac{1}{1.3}-\dfrac{1}{2.4}+\dfrac{1}{3.5}-\dfrac{1}{4.6}+\dfrac{1}{5.7}-\dfrac{1}{6.8}+\dfrac{1}{7.9}-\dfrac{1}{8.10}\)
ai biết giúp mk nha ...thanks nhìu....đúng mk tik
Thu gọn:
(1+1/1.3)(1+1/2.4)(1+1/3.5)....(1+1/99.100)
Các bn giúp mik nha!Mik cần gấp nạ!Các bn nhớ giải chi tiết nhé!Thank you@@@
1) A=7/10.11+7/10.12+7/10.13+...+7/69.70
2) B=1/25.27+1/27.29+1/29.31+...+1/73.75
3) C=4/2.4+4/4.6+4/6.8+...+4/2008.2010
P=1.3+2.4+3.5+...+97.99+98.100