1 |
4x |
x1+x2 |
2 |
1 |
2 |
1 |
4x |
x⋅
|
1 |
4x |
1 |
-4x |
(-x)⋅
|
x1+x2 |
2 |
1 |
2 |
π |
2 |
x3 |
2 |
1 |
x |
1 |
2 |
A.② | B.③ | C.②③ | D.①③ |
1 |
2 |
1 |
2 |
1 |
2 |
A.0 | B.1 | C.2 | D.3 |
A.若l⊥α,m⊥α,则l∥m | B.若m⊥l,l⊂α,则m⊥α |
C.若m∥l,l∥α,则m∥α | D.若l⊥m,m⊥α,则l∥α |
A.3个 | B.2个 | C.1个 | D.0个 |
x2 |
a2 |
y2 |
b2 |
b2 |
a2 |
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