30 + 6 = 36     60 + 9 = 69     52 + 6 = 58     82 + 3 = 85

40 + 5 = 45     70 + 2 = 72     6 + 52= 58     3 + 82 = 85

30 + 6 = 36         60 + 9 = 69              52 + 6 = 58      83 + 2 = 85     40 + 5 = 45     70 + 2 = 72    6 + 52 = 58       3 + 82 = 85

52 x 44 + 84 x 52 + 52 - 52 x 29

= 52 x ( 44 + 84 + 1 - 29 )

= 52 x        100

= 5200

nkớ k nhoa =33

    52x44+84x52+52-52x29

=52x(44+84+1+29)

=52x100

=52 000

                                                                                      HT

A=625

B=10000

a) (-365) + 75 + 365

= (-365 + 365) + 75

= 0 + 75

= 75

b) (-52).76 + (-52).24

= -52.(76 + 24)

= -52.100

= -5200

c) [15 + (2022⁰.37 - 2³] : (-17)

= [15 + (1.37 - 8)] : (-17)

= (15 + 19) : (-17)

= 34 : (-17)

= -2

a) \(19\times\left(52+38\right)-9\times\left(52+38\right)=\)

\(=\)     \(19\times90-9\times90\) 

\(=90\times\left(19-9\right)\) 

\(=90\times10\) 

\(=900\) 

b) \(\dfrac{2}{5}\div\dfrac{3}{7}\times\dfrac{3}{7}\div\dfrac{2}{5}+2019=\)

\(=\left(\dfrac{2}{5}\div\dfrac{2}{5}\right)\times\left(\dfrac{3}{7}\div\dfrac{3}{7}\right)+2019\) 

\(=1\times1+2019\) 

\(=2019\)

  52 + 52 x 6,4 + 2,6 x 52

=52 + 52 x (6,4 + 2,6)

= 52 + 52 x    9

= 52 x 1 + 52 x 9

= 52 x ( 9 +1)

= 52 x    10

=      520

a) \(85\cdot12,7+5+3+12,7=12,7\left(85+1\right)+8=1092,2+8=1100,2\)

b) \(52\cdot143-52\cdot39-8\cdot28=52\left(143-39\right)-\left(-20\right)=52\cdot104+20=5408+20=5428\)

52+52+52+52+52+...+52           +25+25+25+25+25+25...+25

=(52x 75)+(25x 52)

=3900+1300

=5200

chúc bạn học tốt !

Ta có : 52 + 52 + 52 +...+ 52 + 25 + 25 + ....+ 25

         = 75 . 52  + 52 . 25

         = 52 . ( 75 + 25 )

        = 52 . 100

        = 5200