`2/3.5 + 3/5.8 + 11/8.19 + 13/19.32 + 25/32.57 + 30/57.87`

`= 1/3 - 1/5 + 1/5 - 1/8 + 1/8 - 1/19 + 1/19 - 1/32 + 1/32 - 1/57 +  1/57 - 1/87`

`=1/3 - 1/87`

`=87/261 - 3/261`

`= 28/87`

146.47379386

\(\frac{2}{3.5}+\frac{3}{5.8}+\frac{11}{8.19}+\frac{13}{19.32}+\frac{25}{32.57}+\frac{30}{57.87}\)

=\(\frac{1}{3}-\frac{1}{5}+\frac{1}{5}-\frac{1}{8}+\frac{1}{8}-\frac{1}{19}+\frac{1}{19}-\frac{1}{32}+\frac{1}{32}-\frac{1}{57}+\frac{1}{57}-\frac{1}{87}\)

= 1/3 - 1/87

= 28/87

ai giải giúp mk với

cậu never làm đúng rồi đó

lớn hơn bạn ạ

Ta có : 1/61 +1/72 +1/83 +1/94 < 1/60 x4 =1/15

1/16 +1/19 +1/21 < 1/15 x3 =3/15

1/3 =5/15

Do đó: B < 1/15 + 3/15 +5/15 = 9/15= 3/5

Vậy B< 3/5

                                          \(\text{Bài giải}\)

\(\text{Ta có : }\)

 \(B=\frac{1}{3}+\frac{1}{16}+\frac{1}{19}+\frac{1}{21}+\frac{1}{61}+\frac{1}{72}+\frac{1}{83}+\frac{1}{94}\)

B = 0,333333333 + 0,0625 + 0,0526315789 + 0,0476190476 + 0,0163934426 + 0,0138888889 + 0,0120481928 + 0,0106382979

B = 0,549052782

P = 1/3 + 1/16 + 1/19 + 1/21 + 1/61 + 1/72 + 1/83 + 1/94

P = 0, 5490527821

3/5 = 0, 6

Mà 0, 5490527821 < 0, 6

Nên: P < 3/5