1/51+1/52+1/53+...+1/100
làm cả phép tính nha
Tính nhanh A=1/51+1/52+1/53+...+1/100
GIÚP MIK NHA , AI NHANH MIK TICK CHO
TL
50/3227
Hok tốt nghen
Tính tổng 1/51+1/52+1/53+...+1/99+1/100
Ta có:\(\frac{1}{51}+\frac{1}{52}+...+\frac{1}{100}=\left(1+\frac{1}{2}+...+\frac{1}{100}\right)-\left(1+\frac{1}{2}+...+\frac{1}{50}\right)=\left(1+\frac{1}{2}+...+\frac{1}{100}\right)-2.\left(\frac{1}{2}+\frac{1}{4}+...+\frac{1}{100}\right)\)
\(=1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+...+\frac{1}{99}-\frac{1}{100}=1-\frac{1}{100}=\frac{99}{100}\)
Tính A=1/51+1/52+1/53+...+1/99+1/100
Tính A:
A=1/51 + 1/52 + 1/53 + ......... + 1/100
Cho S=1/51+1/52+1/53+...+1/98+1/99+1/100.So sánh S với 1/2.Thanks nha
Tính:
(1/51+1/52+1/53+...+1/100):(1/1x2+1/3x4+1/5x6+...+1/99x100)
tính nhanh 1-2+3-4+5 +.....+51-52+53
1-2+3-4+5-6+...+51-52+53
=(1-2)+(3-4)+...+(51-52)+53
=(-1)+(-1)+...+(-1)+53
=(-1)×26+53
=-26+53
=27
1-2+3-4+5-6+...+51-52+53
=(1-2)+(3-4)+...+(51-52)+53
=(-1)+(-1)+...+(-1)+53
=(-1)×26+53
=-26+53
=27
tính 1/51+1/52+1/53+....+1/100
1/1*2+1/3*4+1/5*6+...+1/99*100
1/51 + 1/52 + 1/53 + ... + 1/100