Question

[Phạm Bảo Ngọc]

Tìm x:

x x 2 + x x 3 + x x 4 + x = 2130

Answer 1

[αβγ δεζ ηθι]

x * 2 + x * 3 + x * 4 + x = 2130

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

x * 10 = 2130

x = 2130 : 10 = 213

Answer 2

[Hoàng Nguyễn Đức]

2x + 3x + 4x + x = 2130

10x = 2130

x = 2130 ÷ 10

x = 213