Question

21分之86减2又5分之1等于多少

Answer 1

86/21-2又1/5
=86/21-11/5
=430/105-231/105
=199/105

Answer 2

21分之86减2又5分之1

86/21 - (2+1/5)
= 4+2/21 - (2+1/5)
= 2 + (2/21 - 1/5)
= 2 + (10/105 - 21/105)
= 2 - 11/105
= (210 - 11)/105
= 199/105