(3.78+5-7分之2+1.22+1又7分之5)*(5又8分之3+1-1.375)
=【(3.78+1.22）+5+（-7分之2+1又7分之5)】*(5.375+1-1.375)
=【5+5+10/7】*5
=50+50/7
=57又1/7