计算:(1)-23÷49×(-23)2(2)[1-(1-0.5×13)]×[2-(-3)2].(3)-|-3+213|-|-13|2+(-13)2×(-1)9×...

2023-07-08 13:42发布

这道初中数学的题目是:
计算:
(1)-23÷
4
9
×(-
2
3
2
(2)[1-(1-0.5×
1
3
)]×[2-(-3)2].
(3)-|-3+2
1
3
|-|-
1
3
|2+(-
1
3
2×(-1)9×(-2)3
(4)-22×(-3.14)-3.14×(-
1
2
)×(-6);
(5)(
7
4
-
7
8
-
7
12
)÷(-
7
8
)+(-
8
3
).
1条回答
鹰派宣传组1
1楼-- · 2023-07-08 13:51
这道初中数学题的正确答案为:
(1)-23÷
4
9
×(-
2
3
2
=-8×
9
4
×
4
9

=-8;

(2)[1-(1-0.5×
1
3
)]×[2-(-3)2]
=[1-(1-
1
6
)]×[2-9]
=[1-
5
6
]×[-7]
=
1
6
×[-7]
=-
7
6


(3)-|-3+2
1
3
|-|-
1
3
|2+(-
1
3
2×(-1)9×(-2)3
=-
2
3
-
1
9
+
1
9
×(-1)×(-8)
=-
2
3
-
1
9
+
8
9

=
1
9


(4)-22×(-3.14)-3.14×(-
1
2
)×(-6)
=-4×(-3.14)-3.14×3
=(4-3)×3.14
=1×3.14
=3.14;

(5)(
7
4
-
7
8
-
7
12
)÷(-
7
8
)+(-
8
3

=(
7
4
-
7
8
-
7
12
)×(-
8
7
)+(-
8
3

=(-
7
4
×
8
7
+
7
8
×
8
7
+
7
12
×
8
7
)+(-
8
3

=-2+1+
2
3
-
8
3

=-3.
解题思路 49

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