`\text{Câu 26 :}`

`a)` `\text{Ta có :}` 

`13 dm^2 8 cm^2 = 1308 cm^2`

`\text{Vì}` `138 cm^2 < 1308 cm^2`

`\text{Nên}` `138 cm^2 < 13 dm^2 8 cm^2`

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`b)` `\text{Ta có :}` 

`2 m^2 99 dm^2 = 299 dm^2`

`\text{Vì}` `300 dm^2 > 299 dm^2`

`\text{Nên}` `300 dm^2 > 2 m^2 99 dm^2`

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`c)` `\text{Ta có :}` 

`35 dm^2 8 cm^2 = 3508 cm^2`

`\text{Vì}` `3508 cm^2 = 3508 cm^2`

`\text{Nên}` `3508 cm^2 = 35 dm^2 8 cm^2`

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`d)` `\text{Ta có :}` 

`26 m^2 50 dm^2 = 2650 dm^2`

`\text{Vì}` `2605 dm^2 < 2650 dm^2`

`\text{Nên}` `2605 dm^2 < 26 m^2 50 dm^2`

$#taik$

a,`138cm^2<13dm^2 8cm^2`

  ` vì  13dm^28cm^2=1308cm^2 mà 138cm^2<1308cm^2`

b,`300dm^2>2m^2 99dm^2`

` vì 2m^2 99dm^2= 299dm^2 mà 300dm^2>299cm^2`

c,`3508cm^2=35dm^2 8cm^2`

 vì `35dm^2 8cm^2=3508 cm^2 mà 3508cm^2=3508cm^2`

d,`2605dm^2 <26m^2 50dm^2`

vì `26m^2 50dm^2=2650dm^2 mà 2605dm^2<2650dm^2`