(1):14.8+(-1/4)-5-(-0.25)
问题描述:
(1):14.8+(-1/4)-5-(-0.25)
(2):(-3/5)+1/5+(-4/5)
(3):-(-2/3)+(-5/6)+[11/4 -(-3/8)-(+14/3)]
答
(1):
14.8+(-1/4)-5-(-0.25)
=14.8-1/4-5+1/4
=14.8-5+(1/4 -1/4)
=9.8
(2):
(-3/5)+1/5+(-4/5)
=-(3/5+4/5)+1/5
=-7/5+1/5
=-6/5
(3):
-(-2/3)+(-5/6)+[11/4 -(-3/8)-(+14/3)]
=2/3-5/6+11/4+3/8-14/3
=2/3-14/3+11/4+3/8-5/6
=-5/4+3/8-5/6
=-30/24+9/24-20/24
=(-30+9-20)/24
=-41/24