8000÷125÷84=8000÷(125×84)=8000÷(125×80+125×4)=8000÷10000+8000÷500=0.8+16=16.8
解:8000÷125÷84=8000÷1000X8÷84=8X2÷21=16/21
8000÷125÷84=8x1000÷125÷84=8x8÷84=32/21