ï¼5å2åä¹1-2å3åä¹1ï¼Ã·1å3åä¹2+3åä¹1
=ï¼5+1/2-2-1/3ï¼Ã·5/3+1/3
=ï¼3+1/6ï¼Ã3/5+1/3
=19/6Ã3/5+1/3
=19/10+1/3
=57/30+10/30
=67/30
=2å30åä¹7
3.6Ãï¼4åä¹3-3åä¹2ï¼+2.5÷ï¼4åä¹3-3åä¹2ï¼
=3.6Ã1/12+2.5÷1/12
=0.3+2.5Ã12
=0.3+30
=30.3
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