= 60 k mk mk k lại cho

10 + 10 x 2 + 10 x 2 + 10

= 10 x (2 + 2 + 1 + 1)

= 10 x 6

= 60

10+10*2+10*2+10

= 10*6

=60

chuc e luon hoc tot!

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

10x2+10x2x10+2=222

nha bạn

k cho mik nha mik k lại cho

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

mk cũng làm giống Trần Thùy Dung

\(\dfrac{7}{10}+3:10+\dfrac{2}{5}+1:10\\ =\left(\dfrac{7}{10}+\dfrac{2}{5}\right)+\left(3:10+1:10\right)\\ =\dfrac{11}{10}+\left(3+1\right)\times\dfrac{1}{10}\\ =\dfrac{11}{10}+4\times\dfrac{1}{10}\\ =\dfrac{11}{10}+\dfrac{2}{5}\\ =\dfrac{3}{2}\)

\(\dfrac{7}{10}+3:10+\dfrac{2}{5}+1:10\\ =\dfrac{7}{10}+\dfrac{3}{10}+\dfrac{2}{5}+\dfrac{1}{10}\\ =\left(\dfrac{7}{10}+\dfrac{3}{10}\right)+\left(\dfrac{2}{5}+\dfrac{1}{10}\right)\\ =\dfrac{10}{10}+\left(\dfrac{4}{10}+\dfrac{5}{10}\right)=\dfrac{10}{10}+\dfrac{5}{10}=\dfrac{15}{10}=\dfrac{3}{2}\)

= \(\dfrac{3}{2}\)

1/10 + 2/10 + 3/10 + 4/10 + 5/10 + 6/10 + 7/10 + 8/10 + 9/10 

= { 1 + 9 } + { 2 + 8 } + { 3 + 7 } + { 4 + 6 } + 5

= 10 + 10 + 10 + 10 + 5

= 45

1/10+2/10+3/10+...+9/10=(1+2+3+4+.....+9)/10=45/10=4,5

=(1+2+3+4+5+6+7+8+9+10)/10=55/10

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

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

= 10 ^{2 + 2} + 10²

= 10 ⁴ + 10² 

= 10000 + 100

= 10100

nhe !

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