9.5-(3.6+3.5)怎麼簡便計算

9.5-(3.6+3.5)怎麼簡便計算


9.5-(3.6+3.5)
=9.5-3.6-3.5
=9.5-3.5-3.6
=6-3.6
=2.4



999*99.9簡便計算


(1000-1)*99.9=1000*99.9-1*99.9=99900-99.9=99800.1



3-九分之5-九分之四簡便運算


原式=3-(5/9+4/9)=3-1=2