π |
4 |
π |
8 |
a |
b |
a |
b |
π |
4 |
π |
8 |
π |
8 |
π |
4 |
2π |
2|a| |
a |
b |
a |
b |
A.∃x∈R,cosx≥1 | B.∀x∈R,cosx≥1 |
C.∃x∈R,cosx>1 | D.∀x∈R,cosx>1 |
x2 |
2 |
y2 |
m |
A.∀x∈R,x2+l<2x | B.∃x∈R,x2+1≤2x |
C.∃x∈R,x2+l≥2x | D.∃x∈R.x2+1<2x |
A.a,b不全为0 | B.a,b全不为0 |
C.a,b至少有一个为0 | D.a≠0且b=0,或b≠0且a=0 |
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