X × 25 + x × 74 + x = 200
=> X x (25 + 74 + 1) = 200
=> X x 100 = 200
=> x = 2
25 x X - X = 14040 : 45
=> X x (25 - 1) = 312
=> X x 24 = 312
=> X = 13
X : 55 = 14,3
=> X = 14,3 x 55
=> X = 786,5
x.25+x.74+x=200
x.(25+74+1)=200
x.100=20
x=200 : 2
x=100
25.x-x=14040 : 45
24.x=312
x=312 : 24
x=13
x : 55 = 14,3
x = 14,3 . 55
x=786,5
"." là nhân
minh cung lam giong may ban kia nha
k tui nha
thanks