x+100-50=300+50

x+100-50=450

x+100=450+50

x+100=500

x=500-100

x=400

x + 100 - 50 = 350

x + 100 = 350+50

x+100= 400

      x= 400-100

      x=300

x + 100 - 50 = 300 + 50

x + 100 - 50 = 350

x + 100 = 350 + 50

x + 100 = 400

      x = 400 - 100

      x = 300

a) 500 + 400 = 900

900 – 400 = 500

900 – 500 = 400

b) 700 + 50 = 750

750 – 50 = 700

750 – 700 = 50

c) 300 + 40 + 6 = 346

300 + 40 = 340

300 + 6 = 306

a) 500+400=900

    900-400=500

    900-500=400

b) 700+50=750

    750-50=700

    750-700=50

c) 300+40+6=346

    300+40=340

    300+6=306

500-x=300+50

500--x=350

x=500-350

x=150

k mk nhe

mk nhanh nhất

500-x=350

x=500-350

x=150

500 - x = 300 + 50 

500 - x =380

         x = 500 - 380

          x =     120

\(x+50=200+300\)

\(x+50=500\)

           \(x=500-50\)

           \(x=450\)

x + 50 = 200 + 300

x + 50 = 500

x         = 500 - 50

x         = 450

x + 50 = 200 + 300

x + 50 = 500

       x  = 500 - 50

       x  = 450                       k mk nha~~

300 - x = 50 + 100

300 - x = 150

         x = 300 - 150

         x = 150

tk đi rồi tk lại

x=150

300-x=150

x=300-150

x=150

k mk nhé 

x + 50 = 300

x = 300 - 50

x = 250

250 nha

x + 50 = 300

x = 300 - 50

x = 250

Vậy x = 250

K mk nha

Mk k lại

( x - 50 ) : 45 + 240 = 300

( x - 50 ) : 45 = 300 - 240

( x - 50 ) : 45 = 60

 x - 50  = 60 x 45

 x - 50  = 2700

        x  = 2700 + 50

        x = 2750 

\(\Leftrightarrow\left(x-50\right)\div45=300-240\)

\(\Leftrightarrow\left(x-50\right)\div45=60\)

\(\Leftrightarrow x-50=60\times45\)

\(\Leftrightarrow x-50=2700\)

\(\Leftrightarrow x=2700+50\)

\(\Leftrightarrow x=2750\)

Vậy x = 2750

\(\left(x-50\right):45+240=300\)

\(\Rightarrow\left(x-50\right):45=60\)

\(\Rightarrow x-50=2700\)

\(\Rightarrow x=2750\)

Vậy x = 2750

\(300-5\times Y+50=250\)

\(5\times Y+50=50\)

\(5\times Y=0\)

\(Y=0\)

Ta có : 300 - 5y + 50 = 250

\(\Leftrightarrow\)350 - 5y = 250

\(\Leftrightarrow\)5y = 350 - 250

\(\Leftrightarrow\)5y = 100

\(\Rightarrow\)y     = 20

Vậy : y = 20

300-5y+50=250

lay 250-50=200 roi lay 300-200=100

lay 100chia cho5 thi se tim ra y

vay y =20

\(2\left(x-1\right)^3-50=-300\)

\(\Leftrightarrow2\left(x-1\right)^3=-300+50\)

\(\Leftrightarrow2\left(x-1\right)^3=-250\)

\(\Leftrightarrow\left(x-1\right)^3=-250:2\)

\(\Leftrightarrow\left(x-1\right)^3=-125\)

\(\Leftrightarrow\left(x-1\right)^3=5^3\)

\(\Leftrightarrow x-1=5\)

\(\Leftrightarrow x=6\)

Vậy \(x=6\)

\(2.\left(x-1\right)^3-50=-300\)

\(\Rightarrow2.\left(x-1\right)^3=-250\)

\(\Rightarrow\left(x-1\right)^3=-125\)

\(\Rightarrow x-1=-5\)

\(\Rightarrow x=-4\)

\(2.\left(x-1\right)^3-50=-300\\ =>2.\left(x^3-1\right)=-250\)

\(=>2x^3=-248\)

\(=>x^3=-124\)

Đề sai hay mk làm sai v ?