两根同样长的电线,第一根用去,第二根用去米,剩下的一样长. .(判断对错)
= :24== %
÷ ═==0.75= : .
= ÷12=18: =2.25=1= %.
=4: = ÷54= (填小数)
=9: =0.6= %= 折.