笔算.(带*的要验算)*468+329 406﹣29 351+287 *900﹣378 65÷7 52÷6.
=0.375=21÷ =6: = %.
5:6可以写成5÷6,比值是1.2.所以2:3:4=2÷3÷4. .
3÷8═= ÷24= %= :56.
3:4= :8=9: == %
3÷ == :12=七成五= %