Current location - Training Enrollment Network - Mathematics courses - Mathematics in senior one. Excuse me, why is the last sentence here "the range is a subset of set B" said to be a subset? Why range and set b are not equal?
Mathematics in senior one. Excuse me, why is the last sentence here "the range is a subset of set B" said to be a subset? Why range and set b are not equal?
Let a = {1, 2,3}
B={2，4，6，7}
F(x)=2x
When a is taken as the domain, the value domain is c = {2 2,4,6}