x + 50 = 50 + 50

x + 50 = 100

x = 100 - 50

x = 50

= 50 nhé bạn

nhớ k mình nhé

x + 60 = 70 + 30

x + 60 = 130

x=  130 - 60

x = 70

K mk nha

x + 60 = 70 + 30

x + 60 = 100

        x = 100 - 60

        x = 40

tk mk mk tk lại

x+600=700+300

x+600=1000

x=1000-600

x=400

x + 600 = 700 + 300

x + 600 = 1000

          x = 1000 - 600

          x = 400

k cho tớ nha

x+50=20+10

x+50=30

x=30-50

x=-20

X+50=20+10

X+50=30

X=30-50

X=-20

Vậy X=-20

C1\(5.10+5.10\)

\(=5.\left(10+10\right)\)

\(=5.20\)

\(=100\)

C2 \(5.10+5.10\)

\(=10.\left(5+5\right)\)

\(=10.10\)

\(=100\)

K MK NHE

CAM ON

10,2

tk mk nhé bn 

thanks bn

a) x + 100 = 50 + 60

x + 100 = 110

x = 110 - 100

x = 10

b) x + 50 = 30 + 60

x + 50 = 90

x = 90 - 50

x = 40

_______________________________________________THE END_____________________________________________________

a)=10

b)40 

tk m nhé

x - 90 = 500 - 200

x - 90 = 300

x        = 300 + 90

x        = 390

x-90=500-200

x-90=300

   x =300+90

   x =390.

x - 20 = 50 + 50

x - 20 = 100

       x = 100 + 20

       x = 120

tk nha

x - 20 = 50 + 50

x - 20 = 100

x       = 100 + 20

x       = 120

\(x-100=500+100\)

\(x-100=600\)

              \(x=600+100\)

              \(x=700\)

Vậy \(x=700\)

chúc bn học gioi!@ shi nit chi

x - 100 = 500 + 100

x - 100 = 600

x         = 600 + 100

x          = 700

x + 300 = 200 x 2

x + 300 = 400

        x   = 400 - 300

        x   = 100

tk nha

x=100