70×80= 4500÷300= 295+198=5 43﹣306=25+67+75= 0÷300= 16﹣16÷16= 25×7×4=
3:4= :8=9: == %
3÷ == :12=七成五= %
÷10==9: == :40.
18: = :20== ÷40=1.2.
1÷4= ÷12==6: = (小数)