A:∠1=∠2
B:∠3=∠4
C:∠DAB+∠ABC=180°
D:∠ABC+∠BCD=180°
设直线(k+1)x+(k+2)y﹣2=0与两坐标轴围成的三角形面积为Sk,则S1+S2+…+S10=____