> 数学 >
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)(-4
7
8
)-(-5
1
2
)+(-4
1
4
)-3
1
8

(5)0+1-[(-1)-(-
3
7
)-(+5)-(-
4
7
)]+|-4|
人气:316 ℃ 时间:2020-04-10 03:16:15
解答
(1)原式=23-17+7-16,
=23+7-17-16,
=-3.
(2)原式=(
2
3
+
1
3
-1)+(-
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
7
8
)+5
1
2
+(-4
1
4
)-3
1
8

=(-4
7
8
-4
1
4
-3
1
8
)+5
1
2

=-12
1
4
+5
1
2
=-6
3
4

(5)原式=1-[(-1)+
3
7
-5+
4
7
]+4,
=1-[(-1+
3
7
+
4
7
)-5]+4,
=10.
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