1.计算(1)-1/3+15.5+(-2/3) (2)-11.5+4.5(3)1/7-2/5 (4)4.7-3.4-(-8.5)

问题描述:

1.计算
(1)-1/3+15.5+(-2/3) (2)-11.5+4.5
(3)1/7-2/5 (4)4.7-3.4-(-8.5)

粉忆幽韵,
(1)-1/3+15.5+(-2/3)
=15.5-1=14.5
(2)-11.5+4.5
=-7
(3)1/7-2/5
=5/35-14/35
=-9/35
(4)4.7-3.4-(-8.5)
=1.3+8.5
=9.8