解: （7又5/7×7/24+4又1/5÷3/5+18.5 ）÷ 9又1/4
=(54/7×7/24+21/5×5/3+18.5)×4/37
=(9/4+7+18.5)×4/37
=(2+7+18+1/4+1/2)×4/37
=27又3/4×4/37
=111/4 ×4/37
=3
