Which of these is equal to $$(0.3+0.4 + 0.5 -0.9)\div0.6$$? 
Overseas Competition->Knowledge Point->Calculation Modules->Decimals->Four Operations of Decimals
Note that $$(0.3+0.4+0.5 -0.9)\div0.6 =(1.2 -0.9)\div0.6 =0.3\div0.6 = 3\div6$$ $$=0.5$$. 