21又34/35÷17
=(21+34/35)X1/17
=21X1/17+34/35X1/17
=21/17+2/35
=1又4/17+2/35
=1+(4/17+2/35)
=1+(140/595+34/595)
=1+174/595
=1又174/595
21又34/35÷17
=(21+34/35)X1/17
=21X1/17+34/35X1/17
=21/17+2/35
=1又4/17+2/35
=1+(4/17+2/35)
=1+(140/595+34/595)
=1+174/595
=1又174/595