7/4

62/72

1/3

5/2

5/2-3/4=7/4

5/2 - 3/4 =20/8-6/8=14/8

1/9+6/8=8/72+54/72=62/72

2/3-1/3=1/3

4/2+1/2=5/2

5 + 2 + 6 + 3 + 8 + 4 + 1 + 0 + 9 + 7+ 10 = 55

Bằng 55

= 55 đúng không bạn

TL

=-3545807085

nha bn chưa chưa chắc đã đúng

HT 

=6,953,656,803,105

TL:

\(=-3545807085\)

Phải dùng đến máy tính

_HT_

\(A=\frac{1}{\frac{3.4}{2}}+\frac{1}{\frac{4.5}{2}}+...+\frac{1}{\frac{19.20}{2}}\)

=>    \(A=\frac{2}{3.4}+\frac{2}{4.5}+...+\frac{2}{19.20}\)

=>   \(\frac{A}{2}=\frac{1}{3.4}+\frac{1}{4.5}+...+\frac{1}{19.20}\)

=>   \(\frac{A}{2}=\frac{1}{3}-\frac{1}{4}+\frac{1}{4}-\frac{1}{5}+...+\frac{1}{19}-\frac{1}{20}\)

=>    \(\frac{A}{2}=\frac{1}{3}-\frac{1}{20}\)

=>   \(\frac{A}{2}=\frac{20-3}{20.3}\)

=>   \(\frac{A}{2}=\frac{17}{60}\)

=>   \(A=\frac{17}{30}\)

VẬY    \(A=\frac{17}{30}\)

Ta có :\(\frac{1}{1+2+3}+\frac{1}{1+2+3+4}+...+\frac{1}{1+2+3+...+19}\)

\(=\frac{1}{3\times4}\times2+\frac{1}{4\times5}\times2+...+\frac{1}{19\times20}\times2\)

\(=2\times\left(\frac{1}{3\times4}+\frac{1}{4\times5}+...+\frac{1}{19\times20}\right)=2\times\left(\frac{1}{3}-\frac{1}{4}+\frac{1}{4}-\frac{1}{5}+...+\frac{1}{19}-\frac{1}{20}\right)\)

\(=2\times\left(\frac{1}{3}-\frac{1}{20}\right)=2\times\frac{17}{60}=\frac{17}{30}\)

             A =\(\frac{1}{3x4:2}\)+ \(\frac{1}{4x5:2}\)+ ...+ \(\frac{1}{19x20:2}\)

             A = \(\frac{2}{3x4}\)+ \(\frac{2}{4x5}\)+...+ \(\frac{2}{19x20}\)

\(\frac{1}{2}\)x  A = \(\frac{1}{3x4}\)+ \(\frac{1}{4x5}\)+...+ \(\frac{1}{19x20}\)

  \(\frac{1}{2}\)x  A = \(\frac{1}{3}\)- \(\frac{1}{4}\)+ \(\frac{1}{4}\)- \(\frac{1}{5}\)+...+\(\frac{1}{19}\)- \(\frac{1}{20}\)

              A = ( \(\frac{1}{3}\)- \(\frac{1}{20}\)) : \(\frac{1}{2}\)

              A = \(\frac{17}{30}\)

dãy trên có số số hạng là

(10000-1):1+1=10000(số )

tổng của dãy trên là 

(10000+1)x1000:2=50005000

d/ss...

\(1+2+3+4+....+10000\)

\(=\left(10000+1\right)+\left(9999+2\right)+.....+\left(5001+5000\right)\)

\(=10001\times5000\)

\(=50005000\)

\(\left(\frac{4}{3}-\frac{2}{3}-\frac{9}{8}\right):\left(1-\frac{4}{5}\right)\)

\(=\left(\frac{2}{3}-\frac{9}{8}\right):\left(1-\frac{4}{5}\right)\)

\(=-\frac{11}{24}:\frac{1}{5}\)

\(=-\frac{55}{24}\)

-55/24

(4/3-2/3-9/8):(1-4/5)

=-11/24:1/5

=-79/120

k cho mk nhé,bn hok tốt

Từ 1 đến 29 có 29 số  hạng.

tổng là:

(29+ 1) x 29 :  2 = 435

ĐS................

(29 + 1).[(29 - 1) + 1]:2 = 30 . 29 : 2 = 15 . 29 = 435

SSH: (29-1):1+1=29

Tổng: (29+1)x29:2=435

x=599