将下列各式写成省略加号的和的形式,并按括号内要求交换加数的位置.(+ 1/2) -(+5)+ (-1/3)-(+1/4)+(-5又2/3);(使分母相同或便于通分的加数在一起)(- 2又2/5)- (- 4.7) -(+0.5)+(+2.4)+(-3.2).(使计算简便)
问题描述:
将下列各式写成省略加号的和的形式,并按括号内要求交换加数的位置.
(+ 1/2) -(+5)+ (-1/3)-(+1/4)+(-5又2/3);(使分母相同或便于通分的加数在一起)
(- 2又2/5)- (- 4.7) -(+0.5)+(+2.4)+(-3.2).(使计算简便)
答
(+ 1/2) -(+5)+ (-1/3)-(+1/4)+(-5又2/3)
=1/2-5-1/3-1/4-17/3
=1/4-6-5
=1/4-44/4
=10又3/4
(- 2又2/5)- (- 4.7) -(+0.5)+(+2.4)+(-3.2)
=-2.4+4.7-0.5+2.4-3.2
=(2.4-2.4)+4.7-(0.5+3.2)
=0+4.7-3.7
=1