a) \(103^2=\left(100+3\right)^2=10000+600+9=10609\)

b) \(52\cdot48=\left(50-2\right)\left(50+2\right)=2500-4=2496\)

c) \(75^2-50\cdot75+25^2=\left(75-25\right)^2=50^2=2500\)

\(103^2=\left(100+3\right)^2=100^2+2.3.100+3^2=10000+600+9=10609\)

\(52.48=\left(50+2\right)\left(50-2\right)=50^2-2^2=2500-4=2496\)

\(75^2-50.75+25^2=75^2-25.75-25.75+25^2=75\left(75-25\right)-25\left(75-25\right)=\left(75-25\right)=50^2=2500\)

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

( -25 ) . 52  + 75 ( - 52 )

= 25 . ( -52 ) + 75 . ( -52 ) 

= ( 25 + 75 ) . ( -52 )

= 100 . ( -52 )

= -5200

Hok tốt 

# owe

Đáp án cần chọn là: D

(-52)+52.(-25).75

= 0.(-25).75

= 0

( -25 ) x 52 + 75 x ( - 52 )

= [ 52 + ( -52 ) ] x [ ( -25 ) x 75 ]

= 0 x -1875

= 0

tik nha

(-25) x 52 + 75 x (-52)

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

= 52 . [(-25) + (-75)]

= 52 . 100

= 5200

a. 4² . 46 + 4² . 52

= 4² . (46+52)

= 16 . 98

= 1568

b. -75+58+(-25)

= [-75+(-25)]+58

= -100+58

= -42

c. -4 . 5 . (-25)

= [-4 . (-25)] . 5

= 100 . 5

= 500

a) A=(135-35).(-47)+53.(-48-52)

      = 100.(-47) + 53.(-100)

     = 100.(-47) + (-53).100

    = 100.(-47+-53)

    = 100.(-100)

   = -10000

làm thử đi đi 

b) B= 25.(75-49) + 75.l25-49l

      = 25.26 + 75.24

     = 50.( 13 + 36)

     = 50.49

     = 2450