x+45=45-45+55:55

x+45=0+1

x+45=1

x=1-45

x=-44

k nhé mk vừa k bn rùi

x + 45 = 45 - 45 + 55 : 55

x + 45 = 45 - 45 + 1

x + 45 = 0 + 1 

x + 45 = 1

        x = 1 - 45

        x = -44

55+45-45+55

= 55+0+55

=   110

ung ho nha*****************

55+45-45+55 = 55 + 0 + 55 = 110

(55+45+15)-(15-55+45)

=115-5

=110

115-5=110

(55+45+15) - (15-55+45) = (100+15) - (-40+45)

                                    = 115 - 5

                                   =110

\(\left(55+45+15\right)-\left(15-55+45\right)\)

\(=55+45+15-15+55-45\)

\(=55+55\)

\(=110\)

= 855x45+ 855x55

= 855x( 45+55)

=855x100

=85500

= 27 x 45 + 27 x 55

= 27 x (45 + 55)

= 27 x 100

= 2700

`#3107.101107`

\(45\times37+93\times45+55\times61+69\times55\)

\(=45\times\left(37+93\right)+55\times\left(61+69\right)\)

\(=45\times130+55\times130\)

\(=130\times\left(45+55\right)\)

\(=130\times100\)

\(=13000\)

\(#GNamK\)

45x37+93x45+55x61+69x55
=45x(37+93)+55x(61+69)

=45x130+55x130
=130x(45+55)

=130x100=13000

-320

\(x:2+250.4=55.61+69.55-45.37-93.45\)

\(\Leftrightarrow x:2+1000=55\left(61+69\right)-45\left(37+93\right)\)

\(\Leftrightarrow x:2+1000=55.130-45.130\)

\(\Leftrightarrow x:2+1000=130\left(55-45\right)\)

\(\Leftrightarrow x:2+1000=130.10\)

\(\Leftrightarrow x:2+1000=1300\)

\(\Leftrightarrow x:2=1300-1000=300\)

\(\Leftrightarrow x=300.2=600\)

Vậy \(x=600\)

X:2+250*4=55*61+69*55-45*37-93*45

X:2+250*4=(55*61+69*55)-(45*37+93*45)

X:2+1000=55*(61+69)-45*(37+93)

X:2+1000=55*130-45*130

X:2+1000=(55-45)*130

X:2+1000=10*130

X:2+1000=1300

X:2=1300-1000

X:2=300

X=300*2

X=600

Vậy X = 600

55 x (45 + 55)

= 55 x 100

= 5500

55 x 45 + 55 x 55 

= 55 x ( 45 + 55 )

= 55 x 100

= 5500