1)134元<200*0.9所购物按照原价500*0.9<466所购物超500元所原价(466-500*0.9)÷0.8+500=16÷0.8+500=20+500=520元所两购物若打折值:520+134=654元2)节省:654-(466+134)=654-600=54元3)若合起:需:500*0.9+(654-500)*0.8=450+154*0.8=450+123.2=573.2元<(466+134)元所更节省