Question

tìm x.

x+100+20=55+145+200.

Answer 1

x+100+20=55+145+200

x+120=400

x=400-120

x=280

Answer 2

x+100+20=55+145+200

x+120=200+200

x+120=400

x       = 400-120

x       = 280

vậy x= 280.

xin lỗi mk biết làm rồi.

Answer 3

x + 100 +20 =400

x + 100        =400-20

 x+ 100       = 380

 x              =  380 - 100

 x              = 280

Answer 4

x + 100 + 20 = 55 + 145 + 200

x + 120         =      400

x                  =   400 - 120

x                  =  280

Answer 5

x + 100 + 20 = 55 + 145 + 200

x + 100 + 20 = 200 + 200

x + 100 + 20 = 400

x + 100         = 400 - 20

x + 100         = 380

x                  = 380 - 100

x                  = 280

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Answer 6

x+100+20=55+145+200

x+120=200+200

x+120=400

x=400-120

x=280

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