两根一样长的铁丝,第一根剪去它的,第二根剪去米.剩下的一样长. .(判断对错)
=15÷ =.
3÷ ==0.375= :24=24: .
=2.5:( )=125%=20÷( )=.
5: ==0.25= %
2.5÷ ==15: = %= (小数)