小朋比小明重,也就是小明比小朋轻. .(判断对错)
10: = =0.5=5÷ = %.
5÷ =25%= :40= = 折.
÷25== = (小数)= %= 成.
12: == :4=0.25= 折.
=2: =4÷ = %=0.2.