\(=12,3\left(6,4+2,6+1\right)=123\)

\(=50,6\times2,3+21,8\times2,5=116,38+54,8=170,88\)

1/1.2 + 1/2.3 + 1/3.4 + ... + 1/x(x + 1) = 99/100
1- 1/2 +1/2-1/3+1/3-1/4+...+ 1/x - 1/ x+ 1 = 99/100
1 - 1/ x+1 = 99/ 100
=> (100 - 1)/ x+1 = 99 / 100
=> x+1 = 100 => x=99

\(\frac{1}{1.2}+\frac{1}{2.3}+...+\frac{1}{x\left(x+1\right)}=\frac{99}{100}\)

\(\Rightarrow1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+...+\frac{1}{x}-\frac{1}{x+1}=\frac{99}{100}\)

\(\Rightarrow1-\frac{1}{x+1}=\frac{99}{100}\)

\(\Rightarrow\frac{1}{x+1}=1-\frac{99}{100}=\frac{1}{100}\)

\(\Rightarrow x+1=100\)

\(\Rightarrow x=99\)

1/3+1/6

=3/6

=>1/2

=1/3 + 6/36 

= 12/36 + 6/36

= 18/36 = 1/2

4,5x1,2-8 : 5

=5,4-1,6=3,8

45 : 2 + 7,2:3

=22,5+2,4=24,9

75 :12+126:15

=6,25+8,4=14,65

x= 2,3

1,5 < x < 4,6

1,5 < 2 ; 3 ; 4 < 4,6

Vậy x = 2 ; 3 ; 4

Hok tốt

\(\frac{x-3}{5}=\frac{x+4}{-2}\)

=> (x - 3). (-2) = 5(x + 4)

=> -2x + 6 = 5x + 20

=> -2x - 5x = 20 - 6

=> -7x = 14

=> x = 14 : (-7)

=> x = -2

x-3/5=x+4/-2

=> ﴾x ‐ 3﴿. ﴾‐2﴿ = 5﴾x + 4﴿

 => ‐2x + 6 = 5x + 20 

=> ‐2x ‐ 5x = 20 ‐ 6 => ‐7x = 14 => x = 14 : ﴾‐7﴿ 

=> x = ‐2 

> =<

số số hạng vế trái là :

( x - 1 ) : 1 + 1 = x ( số )

tổng vế trái là :

( x + 1 ) . x : 2

\(\Rightarrow\)( x + 1 ) . x : 2 = 210

\(\Rightarrow\)( x + 1 ) . x = 420

\(\Rightarrow\)x = 20

Ta có : 

1 + 2 + 3 + ...+ x = ( x + 1 ).x : 2 = 210

=> x . ( x + 1 ) = 210 x 2 = 420

=> x = 20 để 20 x 21 = 420

Ủng hộ mik nhá @@

Tìm X mn nhé

Tìm X mn nhé