A(-1,0),B(4,0),AD=12,D(-1,12),AC=根号(5),C(0,2)
AE斜率=1,方程为y = x+1
ABE面积=1/2AB*AD = 1/2*5*12=30
ABC面积=1/2AB*OC = 1/2 * 5 * 2 = 5
S2 - S1 = (S2+AFB)-(S1+AFB) = ABE面积-ABC面积 = 25
为常数
A(-1,0),B(4,0),AD=12,D(-1,12),AC=根号(5),C(0,2)
AE斜率=1,方程为y = x+1
ABE面积=1/2AB*AD = 1/2*5*12=30
ABC面积=1/2AB*OC = 1/2 * 5 * 2 = 5
S2 - S1 = (S2+AFB)-(S1+AFB) = ABE面积-ABC面积 = 25
为常数