计算:(1)(-7)+(-3)+(+9)+(-1);(2)(-5)-(-7);(3)13-12-34+23;(4)(-225)×(-34)÷(-335);(5)...

2023-07-09 20:14发布

这道初中数学的题目是:
计算:
(1)(-7)+(-3)+(+9)+(-1);
(2)(-5)-(-7);
(3)
1
3
-
1
2
-
3
4
+
2
3

(4)(-2
2
5
)×(-
3
4
)÷(-3
3
5
);
(5)
8
81
×6
3
4
-(-
2
7
)÷(-1
5
7
)+(0.5)2
(6)-(-3)2+(-3)2-(-1)3×(
1
3
-
1
2
)÷
1
6
-|-5|.
1条回答
风笛
2023-07-09 20:27
这道初中数学题的正确答案为:
(1)原式=-7-3+9-1
=-10+9-1
=-1-1
=-2;

(2)原式=-5+7
=2;

(3)原式=
1
3
+
2
3
-
2
4
-
3
4

=1-
5
4

=-
1
4


(4)原式=-
12
5
×(-
3
4
)×(-
5
18

=-
1
2


(5)原式=
8
81
×
27
4
-(-
2
7
)×(-
7
12
)+(
1
2
2
=
2
3
-
1
6
+
1
4

=
8
12
-
2
12
+
3
12

=
9
12

=
3
4


(6)原式=-9+9-(-1)×(-
1
6
)×6-5
=-9+9-1-5
=-6.
解题思路 13

一周热门 更多>