涂一涂,算一算,填一填.(1) + = + = (2) ﹣ = ﹣ = .
:20=20: == %= (最后一空填小数)
9÷ ==37.5%=24: =.
3: ==24÷ = %=0.8.
a除以b的商是2,a就是b的2倍. .
== %=40: = (填小数)