10 x 2 + 10 x 2 x 10 + 2 =222

k mik nha

10 x 2 + 10 x 2 x 10 + 2 = 222

tchs mình tchs lại

Ta có

\(\frac{1}{10}+\frac{2}{10}+\frac{3}{10}+\frac{4}{10}+\frac{5}{10}+\frac{6}{10}+\frac{7}{10}+\frac{8}{10}+\frac{9}{10}\)

\(=\frac{1+2+3+4+5+6+7+8+9}{10}\)

\(=\frac{\left(1+9\right)+\left(2+8\right)+\left(3+7\right)+\left(4+6\right)+5}{10}=\frac{10.4+5}{10}=\frac{45}{10}=\frac{9}{2}\)

Mình cũng làm như Trần Thuỳ Dung và bằng 9/2

\(=\dfrac{1+2+3+4+5+6+7+8+9}{10}\\ =\dfrac{\left(1+9\right)+\left(2+8\right)+\left(3+7\right)+\left(4+6\right)+5}{10}\\ =\dfrac{10+10+10+10+5}{10}=\dfrac{45}{10}=\dfrac{9}{2}\)

9/2

10100

10² x 10² + 10 x 10

= 10² x 10² + 10²

= 100 x 100 + 100

=  10000 + 100

=   10100

10² x 10² + 10 x 10

= 100 x 100 + 10 x 10

= 100 x 100 + 100

= 10000 + 100

= 10100

10² x 10² + 10 x 10

= 100 x 100 + 100

= 100 x (100 + 1)

= 100  x 101

= 10100

10 x 2 + 10 + 10 + 10 

= 20 + 10 + 10 + 10 

= 50 

nha bn

50 k mik nha

5 + 10 + 5 + 10 + (10 x 2)

= (5 + 5) + 10 + 20

=    10    + 10 + 20

=     40

5 + 10 + 5 + 10 + ( 10 x 2 )

= 5 + 10 + 5 + 10 + 20

= ( 5 + 5 ) + ( 10 + 10 ) + 20

= 10 + 20 + 20

= 50

\(10^2+10^2+10+10+5\)

\(=100+100+10+10+5\)

\(=100\times2+10\times2+5\)

\(=200+20+5\)

\(=225\)

\(5\times10+10\times5\)

\(=\left(5+5\right)\times10\)

\(=10\times10\)

\(=100\)

10² + 10² + 10 + 10 + 5

= 100 + 100 + 10 + 10 + 5

= 225

5 . 10 + 10 . 5

= 10 . ( 5 + 5 )

= 10 . 10

= 100

50 x 2 + 8 x 50

= (2 + 8) x 50

=     10   x 50

=       500

10 + 10 + 10 + 50 + 50 + 10 + 10

= (10 x 5) + (50 + 50)

=     50     +     100

=         150

50 x 2 + 8 x 50 

= 50 x ( 2 + 8 ) 

= 50 x    10 

= 500

10 + 10 + 10 + 50 + 50 + 10 + 10

= 10 x 5 + 50 x 5 

=    50    +   250

=         300