100与80的和,除以它们的差,商是多少?列式为100+80÷100﹣80. .(判断对错)
÷ =0.375== :32= %
2:5= :10=10÷ = (填小数)
0.4= : =10: = :35= %
=20÷ =8: =0.8= %= .
=3÷2=15: = %= (小数)