an+90 |
n |
|
|
n(n-1) |
2 |
an+90 |
n |
n |
2 |
90 |
n |
1 |
2 |
45 |
180 |
an+90 |
n |
an+90 |
n |
168 |
13 |
2352 |
182 |
an+90 |
n |
181 |
14 |
2353 |
182 |
an+90 |
n |
168 |
13 |
168 |
13 |
A.{x|x+3=3} | B.{x|x2-x+1=0} |
C.{x|x2<x} | D.{(x,y)|y2=-x2,x,y∈R} |
A.4 | B.3 | C.8 | D.7 |
A.1 | B.2 | C.3 | D.4 |
A.M=(-1,1) | B.M=(-1,1] | C.-1∈M | D.1⊆M |
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