Question

X*2+X*3+X*4+X=2130

Answer 1

213

Answer 2

`x xx 2 + x xx 3 + x xx 4 + x = 2130`

`x xx ( 2 + 3 + 4 + 1 ) = 2130`

`x xx 10 = 2130`

`x = 2130 : 10`

`x = 213`

Answer 3

Answer 4

x.2 + x.3 + x.4 + x.1 = 2130

x.(2 + 3 + 4 + 1) = 2130

x.10 = 2130

x     = 2130 : 10

x     = 213

Answer 5

Bằng 213 nha !