(-81)÷1/4+4/9÷(-16)
= -324-1/36
= 负324又1/36
(3/14-7/8-7/12)*(-1又1/7)
=(36/168-147/168-98/168)*(-1又1/7)
=(-209/168)*(-1又1/7)
=209/147
=1又62/147
(-81)÷1/4+4/9÷(-16)
= -324-1/36
= 负324又1/36
(3/14-7/8-7/12)*(-1又1/7)
=(36/168-147/168-98/168)*(-1又1/7)
=(-209/168)*(-1又1/7)
=209/147
=1又62/147