42+6×(12﹣4)在这道题中应先算 ,再算 ,最后算 .
0.6=3: = ÷15= 成= %
4: == ÷10= %
36÷ ==0.4=4: = %
:20==80%=20÷ = (填小数)
==12÷ = (填小数)