Упростить: 3,4n + 4.7n - n - 2.1n=?

Question

Упростить: 3,4n + 4.7n - n - 2.1n=?

Answer 1

3,4n+4,7n-n-2,1n=(3,4+4,7-1-2,1)n= 5n

Answer 2

3,4n+4.7n-n-2.1n=8.1n-n-2.1n=7.1n-2.1n=5n