Question

Answer 1

`a)20,21×65+34×20,21+20,21`

`=20,21×(65+34+1)`

`=20,21×100=2021`

_________________________

`b)20,22×123+4×202,22−20,22×27`

`=20,22×(123+4−27)`

`=20,22×100=2022`

_________________________

`c)0,01+0,02+0,03+0,04+0,05+0,95+0,96+0,97+0,98+0,99`

`=(0,01+0,99)+(0,02+0,98)+(0,03+0,97)+(0,04+0,96)+(0,05+0,95)`

`=1+1+1+1+1`

`=5`

`#Phuongg`

Answer 2

a, 

= 20,21 x (65 + 34 + 1)

= 20,21 x 100

= 2021

b,

= 20,22 x (123 + 4 - 27)

= 20,22 x 100

= 2022

c,

= 

= (0,01 + 0,99) + (0,02 + 0,98) + (0,03 + 0,97) + (0,04 + 0,96) + (0,05 + 0,95)

= 1 + 1 + 1 + 1 + 1

= 5

Answer 3

a) \(20,21\times65+34\times20,21+20,21\times1\)

\(=20,21\times\left(65+34+1\right)\)

\(=20,21\times100=2021\)

\(\)_____________________________________

b) \(20,22\times\left(123+4-27\right)\)

\(=20,22\times100\)

\(=2022\)

________________________________________

c) \(=\left(0.01+0,99\right)+\left(0,02+0,98\right)+\left(0,03+0,97\right)+\left(0,04+0,96\right)+\left(0,05+0,95\right)\)

\(=1+1+1+1+1\)

\(=5\)

\(\)\(#Siliver\)

Answer 4

a, 

= 20,21 x (65 + 34 + 1)

= 20,21 x 100

= 2021

b,

= 20,22 x (123 + 4 - 27)

= 20,22 x 100

= 2022