计算: (1)23-17-(-7)+(-16) (2)2/3+(-1/5)-1+1/3 (3)(-26.54)+(-6.4)-18.54+6.4 (4)(-47/8)-(-51/2)+(-41/4)-31/8 (5)0+1-[(-1)-(-
问题描述:
计算:
(1)23-17-(-7)+(-16)
(2)
+(-2 3
)-1+1 5
1 3
(3)(-26.54)+(-6.4)-18.54+6.4
(4)(-4
)-(-57 8
)+(-41 2
)-31 4
1 8
(5)0+1-[(-1)-(-
)-(+5)-(-3 7
)]+|-4| 4 7
答
(1)原式=23-17+7-16,
=23+7-17-16,
=-3.
(2)原式=(
+2 3
-1)+(-1 3
),1 5
=-
.1 5
(3)原式=(-26.54)-18.54+[(-6.4)+6.4],
=(-26.54)-18.54,
=-45.08.
(4)原式=(-4
)+57 8
+(-41 2
)-31 4
,1 8
=(-4
-47 8
-31 4
)+51 8
,1 2
=-12
+51 4
=-61 2
.3 4
(5)原式=1-[(-1)+
-5+3 7
]+4,4 7
=1-[(-1+
+3 7
)-5]+4,4 7
=10.