二分之一减负三又四分之一加二点七五减七又二分之一怎样做

2024-11-20 06:29:07
推荐回答(3个)
回答1:

1/2-3又1/4+2.75-7又1/2
=(1/2-7又1/2)+(2.75-3.25)
=(-7)+(-0.5)
=-7.5

回答2:

=0.5+3.25+2.75-7.5
=6.5-7.5
=-1

回答3:

1/2-(-3又1/4)+2.75-7又1/2
=1/2+13/4+11/4-7又1/2
=1/2-7又1/2+(13/4+11/4)
=-7+6
=-1