7/8+(1/4-1/5)除以1/4
=7/8+(1/4-1/5)÷1/4
=7/8+(1/4)÷1/4-(1/5)÷1/4
=7/8+1-4/5
=7/8+1/5
=(35+8)/40
=43/40
=1又3/40
23*1/5+76除以5+1/5
=23*1/5+76÷5+1/5
=23/5+76/5+1/5
=(1/5)*(23+76+1)
=(1/5)*(100)
=20