0.63*7.5+0.063*25怎樣簡便計算
=0.063*(10*7.5+25)=0.063*100=6.3
6分之1*25+25*6分之5簡便計算
6分之1*25+25*6分之5
=25*(1/6+5/6)
=25*1
=25
25/36除[5/12+5/9]的簡便運算
把後面的式子換成以36為分母的式子,然後只用分母相除,及25/35=5/7
簡便運算6.4*1.25*12.5=
6.4*1.25*12.5
=8*1.25*0.8*12.5
=10*10
=100