`a,`

`13 \times 100 + 2 \times 100 - 9 \times 100`

`= 100 \times (13+2-9)`

`= 100 \times 6`

`= 600`

`b,`

`10 - 8 + 9 - 7 + 6 - 4 + 5 - 3 +2 - 0`

`= (10-8)+(9-7)+(6-4)+(5-3)+2`

`= 2+2+2+2+2`

`= 10`

100 x100 x 100 x 100 = 100 000 000

Mong các bạn ủng hộ mk nha !!! Bạn nào k mk mk k lại nhaaa !!!!

Chúc các bạn học giỏi như củ tỏi <3

100 x 100 x 100 x 100

= 100000000

Ủng hộ mk nha ^_-

=100000000

243,05

0,00046

123,7

1237

0,346

243,05

460

123,7

1237

0,346

24,305 x 10 = …243,05…..

0,46 x 1000 = …460….

100 x 1,237 = …123,7….

12,37 x100= ....1237....

34,6 x 0,01 = …0,346…. 

30000 do ban

10200

k minh minh k lai...^_^...

100 + 100 + 100 x 100

= 100 x 2 + 100 x 100

= 100 x (100 + 2)

= 100 x 102

= 10200

k mk nha, mik nhah nhất đó

chỉ cần ấn đúng nha

\(\left(\frac{1}{1\cdot2}+\frac{1}{2\cdot3}+\frac{1}{3\cdot4}+...+\frac{1}{9\cdot10}\right)\cdot100-\left[\frac{5}{2}:\left(x+\frac{206}{100}\right)\right]:\frac{1}{2}=89\)

\(\left(1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+...+\frac{1}{9}-\frac{1}{10}\right)\cdot100-\left[\frac{5}{2}:\left(x+\frac{103}{50}\right)\right]\cdot2=89\)

\(\left(1-\frac{1}{10}\right)\cdot100-\frac{5}{2}:\left(x+\frac{103}{50}\right)\cdot2=89\)

\(\frac{9}{10}\cdot100-\frac{5}{2}\cdot2:\left(x+\frac{103}{50}\right)=89\)

\(90-5\cdot\left(x+\frac{103}{50}\right)=89\)

\(5\cdot\left(x+\frac{103}{50}\right)=1\)

\(x+\frac{103}{50}=\frac{1}{5}\)

\(x=-\frac{93}{50}\)

=4 x 126 x 26140 + 2500 -8400

=13174560 +2500 -8400

=13168660

sai rồi

= 4x126x 100( 26134+ 250 -84)

=  504 x 12630000

= 1325520000

\(\frac{9}{10}.100-\left(\frac{5}{2}\left(y+\frac{206}{100}\right)\right):\frac{1}{2}=89\)

\(90-\left(\frac{5}{2}\left(y+\frac{103}{50}\right)\right)=89.\frac{1}{2}\)

\(90-\left(\frac{5}{2}\left(y+\frac{103}{50}\right)\right)=\frac{89}{2}\)

\(\frac{5}{2}\left(y+\frac{103}{50}\right)=90-\frac{89}{2}\)

\(\frac{5}{2}\left(y+\frac{103}{50}\right)=\frac{180}{2}-\frac{89}{2}\)

\(\frac{5}{2}\left(y+\frac{103}{50}\right)=\frac{91}{2}\)

\(y+\frac{103}{50}=\frac{91}{2}.\frac{2}{5}\)

\(y+\frac{103}{50}=\frac{91}{5}\)

\(y=\frac{91}{5}-\frac{103}{50}\)

\(y=\frac{910}{50}-\frac{103}{50}\)

\(y=\frac{807}{50}\)

Vậy
80,9 x 10      =              8,09 x100

13,5 x50   >     1,35  x 100

9,07 x30     <     90,7 x30

4,897 x100   <  49,87 x100 

3,67 x 1000  <      367x100

0456x1000     >  4,56 x10

=

>

<

<

<

>

80,9 x 10 = 809                    8,09 x100=809

13,5 x50 = 675       1,35  x 100=135

9,07 x30 = 272,1         90,7 x30=2721

4,897 x100=489,7     49,87 x100 =4987

3,67 x 1000 = 3670    367x100=36700

0456x1000 = 456000      4,56 x10=45,6

\(100\times100=10000\) 

10000 nha

 đúng