Question

x nhân 102 trừ x trừ x =4200

Answer 1

X x 102 - X - X = 4200

X x 102 - X x 1 - X x 1 = 4200

X x ( 102 - 1 - 1 ) = 4200

X x 100 = 4200

X.         = 4200 : 100

X = 42

Answer 2

x . 102 - x - x = 4200

x . 102 - x . 1 - x . 1 = 4200

x . (102 - 1 - 1) = 4200

x . 100 = 4200

x          = 42

Answer 3

theo đề ra,ta có:

\(102x-x-x=4200\)

\(\Rightarrow100x=4200\)

\(\Rightarrow x=42\)