计算:(1)-3-(-5);            (2)3712-114-2712+1.25-418;(3)-22×(-3)-15÷56+12×(12-13)...

2023-07-09 16:34发布

这道初中数学的题目是:
计算:
(1)-3-(-5);              
(2)3
7
12
-1
1
4
-2
7
12
+1.25-4
1
8

(3)-22×(-3)-15÷
5
6
+12×(
1
2
-
1
3
3
2
; 
(4)|2+(-
1
2
)
3
×52|÷9÷
1
(-0.75)2
1条回答
honglajiao
1楼-- · 2023-07-09 16:55
这道初中数学题的正确答案为:
(1)-3-(-5),
=-3+5,
=2;

(2)3
7
12
-1
1
4
-2
7
12
+1.25-4
1
8

=(3
7
12
-2
7
12
)+(-1
1
4
+1.25)-4
1
8

=1-4
1
8

=-3
1
8


(3)-22×(-3)-15÷
5
6
+12×(
1
2
-
1
3
)×
3
2

=-4×(-3)-15×
6
5
+12×
1
6
×
3
2

=12-18+3,
=15-18,
=-3;

(4)|2+(-
1
2
3×52|÷9÷
1
(-0.75)2

=|2-
1
8
×25|×
1
9
×
16
9

=
9
8
×
1
9
×
16
9

=
2
9
解题思路 712

一周热门 更多>