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找出0°~360°内与下列各角终边相同的角,并判断它们是第几象限角.下列说法正确的是 (1)420°; (2)-810°; (3)-80°; (4)-220°.
A.
(1)因为420°=60°+360°,所以在 0°~360°内与420°终边相同的角是60°,它是第一象限角。
B.
(2)因为-810°=270°-3×360°,所以在 0°~360°内与-810°终边相同的角是270°,它是非象限角。
C.
(3)因为-80°=280°-360°,所以在 0°~360°内与-80°终边相同的角是280°,它是第四象限角。
D.
(4)因为-220°=140°-360°,所以在 0°~360°内与-220°终边相同的角是140°,它是第二象限角。
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