Tìm số hạng không chứa x trong khai triển (x+1/x)

2(n-1)+4n=2(3n-1)n=0no solutioninfinitely many solutions n= - 4 !

Given: x + y = 6. if xe (-15, -6, -1), then which of the following sets of ordered pairs are solutions? © {(-15, -21), (-6, -12), (-1, -7)} [(-15, 21), (-6, , 7)} {(-15, 21), (-6, 12), (-1, -7)}

One of the same side angles of two parallel lines is 20° smaller than the other one. find the measures of these two angles.