làm nhanh hộ mik nha!

a) 22,37 x 53,41 - 120 + 46,59 x 22,37 

= 22,37 x ( 53,41 + 46,59 ) - 120

= 22,37 x 100 - 120

= 2237 - 120

= 2117

b) 2021 x $\frac{2323}{5959}$  + 2021 x $\frac{363636}{595959}$ 

= 2021 x $\frac{23}{59}$ + 2021  $\frac{36}{59}$ 

= 2021 x ( $\frac{23}{59}$ + $\frac{36}{59}$ )

= 2021 x 1

= 2021

c) 1$\frac{1}{21}$ : ( 15,75 - 15$\frac{1}{4}$ ) + 2$\frac{1}{12}$ : ( 7$\frac{3}{4}$ - 7,25 )

= ( 1 + $\frac{1}{21}$ ) : ( 15,75 - ( 15 + $\frac{1}{4}$ ) )+ ( 2 + $\frac{1}{12}$ ) : ( ( 7 + $\frac{3}{4}$ ) - 7,25 )

= ( 1 + $\frac{1}{21}$ ) : ( 15,75 - 15 - $\frac{1}{4}$ )+ ( 2 + $\frac{1}{12}$ ) : ( 7 + $\frac{3}{4}$ - 7,25 )

= ( 1 + $\frac{1}{21}$ ) x 2 + ( 2 + $\frac{1}{12}$ ) x 2

= 2 x ( 1 + $\frac{1}{21}$ + 2 + $\frac{1}{12}$ )

= 2 x $\frac{263}{84}$ 

= $\frac{263}{42}$ 

d) ( $\frac{2017}{2021}$ + $\frac{2018}{2019}$ + $\frac{2020}{2023}$ ) x ( $\frac{1}{3}$ + $\frac{1}{4}$ - $\frac{7}{12}$ )

  Ta thấy $\frac{1}{3}$ + $\frac{1}{4}$ - $\frac{7}{12}$ = 0 nên

  ( $\frac{2017}{2021}$ + $\frac{2018}{2019}$ + $\frac{2020}{2023}$ ) x 0 = 0

e) $\frac{2019 x 2021 + 2020}{2020 x 2021 - 1}$ 

= $\frac{2019 x 2021 + 2020}{( 2019 + 1 ) x 2021 - 1}$ 

= $\frac{2019 x 2021 + 2020}{ 2019 x 2021 + 2021 x 1 - 1}$ 

= $\frac{2019 x 2021 + 2020}{2019 x 2021 + 2020}$ 

= 0

f) $\frac{637 x 527 - 189}{526 x 637 + 448}$ 

= $\frac{637 x ( 526 + 1 ) - 189}{526 x 637 + 448}$ 

= $\frac{637 x 526 + 637 x 1 - 189}{526 x 637 + 448}$ 

= $\frac{637 x 526 + 448}{526 x 637 + 448}$ 

= 0

 ~ xin câu trả lời hay nhất nhé! ~