是1又1/5×【(12.5+4又1/6÷75%)】-1又1/3还是1又1/5×【(12.5+4又1/6÷75%)】-1又2/3?
前者=6/5×【25/2+25/6×4/3】-4/3
=6/5×25/2+6/5×25/6×4/3-4/3
=15+5×4/3-4/3
=15+16/3
=20又1/3
后者=20
是1又1/5×【(12.5+4又1/6÷75%)】-1又1/3还是1又1/5×【(12.5+4又1/6÷75%)】-1又2/3?
前者=6/5×【25/2+25/6×4/3】-4/3
=6/5×25/2+6/5×25/6×4/3-4/3
=15+5×4/3-4/3
=15+16/3
=20又1/3
后者=20