(+1又1/4)-(+5)+(-1/3)+(-5又2/3)简便计算.

(+1又1/4)-(+5)+(-1/3)+(-5又2/3)简便计算.
(+1又1/4)-(+5)+(-1/3)+(-5又2/3)简便计算.

(+1又1/4)-(+5)+(-1/3)+(-5又2/3)简便计算.
(+1又1/4)-(+5)+(-1/3)+(-5又2/3)
=[(+1又1/4)-(+5)]+[(-1/3)+(-5又2/3)]
=-3又3/4+（-6）
=-9又3/4

原式=1+1/4-5-1/3-5-2/3
=1+1/4-10-1
=1/4-10
=-9又3/4