=1/5-1/6+1/6-1/7+1/7-...+1/9-1/10
=2/10-1/10=1/10
=1/5-1/6+1/6-1/7+1/7-...+1/9-1/10
=2/10-1/10=1/10
=1/5-1/6+1/6-1/7+1/7-...+1/9-1/10
=2/10-1/10=1/10
=1/5-1/6+1/6-1/7+1/7-...+1/9-1/10
=2/10-1/10=1/10
A= 1/1.2 + 1/2.3 + 1/3.4 + 1/4.5 + 1/5.6 + 1/6.7 + 1/ 7.8 + 1/ 8.9 + 1/ 9.10
A=1/2.3+1/3.4+1/5.6+1/6.7+1/7.8+1/8.9+1/9.10
Mọi người giúp em câu này nha
Chiều nay em thi rồi
giúp mình với
a) A=1/3.4-1/4.5-1/5.6-...-1/9.10
b)B=7/3.4-9/4.5+11/5.6-13/6.7+15/7.8-17/8.9
Ai làm được mình cho 1 like :))
Chứng minh rằng:
\(\frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+\frac{1}{4.5}+\frac{1}{5.6}+\frac{1}{6.7}+\frac{1}{7.8}+\frac{1}{8.9}+\frac{1}{9.10}\)
1/2.3+1/3.4+1/4.5+1/5.6+1/6.7+1/7.8+1/8.9+1/9.10+1/10.11+1/11.12+1/12.13+1/13.14+1/14.15
CHÚ Ý:
"/"là phần
1.1+1.2+2.3+3.4+4.5+5.6+6.7+7.8+8.9+9.10+10
A=1.2+2.3+3.4+4.5+5.6+6.7+7.8+8.9+9.10+...+2016.2017
1.2+2.3+3.4+4.5+5.6+6.7+7.8+8.9+9.10
Tính theo cách hợp lí:
M = \(\frac{1}{9.10}-\frac{1}{8.9}-\frac{1}{7.8}-\frac{1}{6.7}-\frac{1}{5.6}-\frac{1}{4.5}-\frac{1}{3.4}-\frac{1}{2.3}-\frac{1}{1.2}\)
Tinh 1/3.4-1/4.5-1/5.6-1/6.7-1/7.8-1/8.9