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单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,平面直角坐标系中的图形面积问题,专题二 知面积求点,例,1,已知,ABC,,,A,(-2,,,0),,,B,(3,,,0),,,ABC,的面积为,10,,点,C,为,y,轴上一点,求点,C,的坐标,.,变式,1,已知,ABC,,,A,(-2,,,0),,,B,(3,,,0),,,ABC,的面积为,10,,点,C,的横坐标为,1,,求点,C,的坐标,.,变式,2,已知,ABC,,,A,(2,,,0),,,B,(7,,,0),,,ABC,的面积为,10,,点,C,为,y,轴上一点,求点,C,的坐标,.,变式,3,已知,ABC,,,A,(2,,,0),,,B,(7,,,0),,,ABC,的面积为,10,,点,C,的横,坐标为,2,,求点,C,的坐标,.,例,2,已知,ABC,,,A,(0,,,2),,,B,(0,,,-5),,,ABC,的面积为,14,,点,C,为,x,轴上一点,求点,C,的坐标,.,变式,1,已知,ABC,,,A,(0,,,2),,,B,(0,,,-5),,,ABC,的面积为,21,,点,C,的纵,坐标为,-7,,求点,C,的坐标,.,变式,2,已知,ABC,,,A,(0,,,2),,,A,B=7,,点,B,在,y,轴上,,ABC,的面积为,21,,点,C,为坐标轴上,,一点,求点,B,和点,C,的坐标,.,例,3,已知,ABC,,,A,(2,,,-2),,,B,(7,,,-2),,,ABC,的面积为,20,,点,C,为,y,轴上一点,求点,C,的坐标,.,变式,1,已知,ABC,,,A,(-7,,,2),,,B,(-2,,,2),,,ABC,的面积为,30,,点,C,为,y,轴上一点,求点,C,的坐标,.,例,4,已知,ABC,,,A,(-2,,,2),,,B,(-2,,,-7),,,ABC,的面积为,27,,点,C,为,x,轴上一点,求点,C,的坐标,.,变式,1,已知,ABC,,,A,(2,,,7),,,B,(2,,,2),,,ABC,的面积为,30,,,点,C,为,x,轴上一点,求点,C,的坐标,.,例,5,已知,A,(0,,,1),,,B,(2,,,0),,点,P,为,x,轴上一点,APB,的面积为,4.5,,求点,P,的坐标,.,变式,1,已知,A,(0,,,1),,,B,(2,,,0),,,点,P,为,y,轴上一点,APB,的面积为,4.5,,求点,P,的坐标,.,变式,2,已知,A,(0,,,1),,,B,(2,,,0),,,C,(4,,,3),(1),求,ABC,的面积,(,2,)若点,P,在坐标轴上,,ABC,的面积,与,APB,的面积相等,求点,P,的坐标,.,
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