如图所示,在Rt△ABC中,∠C=90°,AM是∠CAB的平分线,CM=1.5cm,若AB=6cm,则S△AMB=________cm2.

如图所示,在Rt△ABC中,∠C=90°,AM是∠CAB的平分线,CM=1.5cm,若AB=6cm,则S_△_AMB=________cm².　