1. 166又20分之1 除以 41
=(164+41/20)÷41
=164÷41+41/20÷41
=4+1/20
=4又1/20
2. 【9又7分之2+7又9分之2】除以【7分之5+9分之5】
=【65/7+65/9】÷80/63
=65×【1/7+1/9】×63/80
=65×【1/7×63/80+1/9×63/80】
=65×1/5
=13
3. 4.75-9.36+【8.25-1.37】
=(4.75+8.25)-(9.36+1.37)
=13-10.73
=2.27
4. 6.73-2又17分之8+【3.27-1又17分之9】
=(6.73+3.27)-(2又8/17+1又9/17)
=10-4
=6
5. 7又9分之5-【3.8+1又9分之5】-1又5分之1
=(7又5/9-1又5/9)-(3.8+1.2)
=6-5
=1