计算:(1)4.7-(-8.9)-7.5+(-6)(2)492425×(-5)(3)(79-216-134)÷(-16)2(4)(-5)×313+2×313-6...

2023-07-09 08:06发布

这道初中数学的题目是:
计算:
(1)4.7-(-8.9)-7.5+(-6)
(2)49
24
25
×(-5)
(3)(
7
9
-2
1
6
-1
3
4
)÷(-
1
6
2
(4)(-5)×3
1
3
+2×3
1
3
-6×3
1
3

(5)(-1)2011-(-22)×(-1)5-36×(-
1
3
)2
1条回答
风笛
2023-07-09 08:14
这道初中数学题的正确答案为:
(1)4.7-(-8.9)-7.5+(-6)
=4.7+8.9-7.5-6
=13.6-13.5
=0.1;

(2)49
24
25
×(-5)
=(50-
1
25
)×(-5)
=50×(-5)-
1
25
×(-5)
=-250+
1
5

=-249
4
5


(3)(
7
9
-2
1
6
-1
3
4
)÷(-
1
6
2
=(
7
9
-2
1
6
-1
3
4
)×36
=28-78-63
=-113;

(4)(-5)×3
1
3
+2×3
1
3
-6×3
1
3

=(-5+2-6)×3
1
3

=-9×3
1
3

=-30;

(5)(-1)2011-(-22)×(-1)5-36×(-
1
3
)2

=-1-4×1-36×
1
9

=-1-4-4
=-9.
解题思路 2425

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