\(\dfrac{1}{3}+\dfrac{6}{5}-\dfrac{1}{5}+\dfrac{2}{3}=2\)

1/3+6/5−1/5+2/3=2

Ty

1212/1515 = 1212 :1515 

= 12 x 101 : 15 x 101 

= 12/15

dinh hoang vu

\(\frac{1212}{1515}=\frac{1212\div101}{1515\div101}\)

\(=\frac{12}{15}=\frac{4}{5}\)

\(\frac{1212}{1515}=\frac{2^2.3.101}{3.5.101}=\frac{2^2}{5}=\frac{4}{5}\)

120 ****

2 x 3 x 4 x 5 

= 6 x 20 

= 120 

=[ 2 x 5 ] x [ 3 x 4 ]

= 10 x 12

= 120

\(5,65\cdot13,8+35,7\cdot3,21+5,56\cdot21,9+35,7\cdot1,14\)

\(=5,65\left(13,8+21,9\right)+35,7\left(3,21+1,14\right)\)

\(=5,65\cdot35,7+35,7\cdot4,35\)

\(=35,7\left(5,65+4,35\right)\)

\(=35,7\cdot10=357\)

50056456+(56442424455x2)=50056456+112884848910

                                         =112934905366

2,5 x 12 ,5 x 8 x 0,4=(2,5 x 0,4 ) x(12,5 x8)

                            =1x100=100

=2,5 x 12,5 x 8 x 0,4

=(2,5 x 0,4) x (12,5 x 8)

=1 x 100

=100

Tính bằng cách thuận tiện nhất: 2,5x12,5x8x0,4=100

k mik nha

  25x20x125x8-8x20x5x125

=(25x8)x(20x125)-(20x5)x(8x125)

=200x2500-100x1000

=500000-100000=400000

mk tính giống bạn kia

giai giup minh nha

476x72+476x28

=476x(72+28)

=476x100

=47 600

476x72+476x28

=476x(72+28)

=476x100

=47 600

54x342-44x342

=342x(54-44)

=342x10

=3 420

54x342-44x342

=342x(54-44)

=342x10

=3 420

54x342-44x342

=342x(54-44)

=342x10

=3 420