A.第一象限 | B.第二象限 | C.第三象限 | D.第四象限 |
A.α的取值范围是[0°,180°) |
B.k的取值范围是R |
C.k=tanα |
D.当α∈(90°,180°)时,α越大k越大 |
A.b>0,d<0,a<c | B.b>0,d<0,a>c |
C.b<0,d>0,a<c | D.b<0,d>0,a>c |
A.30°w | B.45° | C.60° | D.135° |
3 |
A.30° | B.150° | C.60° | D.120° |
A.c>0 | B.c<0 | C.ac≥0 | D.ac≤0 |
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