(17又27/7+27又17/7-11又39/37)÷(13又17/12+8又27/17-5又39/38)
=(2x8又27/17+2x13又17/12-2x5又39/38)÷(13又17/12+8又27/17-5又39/38)
=2x(13又17/12+8又27/17-5又39/38))÷(13又17/12+8又27/17-5又39/38)
=2
选A.2
(17又27/7+27又17/7-11又39/37)÷(13又17/12+8又27/17-5又39/38)
=(2x8又27/17+2x13又17/12-2x5又39/38)÷(13又17/12+8又27/17-5又39/38)
=2x(13又17/12+8又27/17-5又39/38))÷(13又17/12+8又27/17-5又39/38)
=2
选A.2