题目内容

怎样简便就怎样计算.
①57.5-4.25-15.75 ②125×
2
3
×8×
3
4
5
7
×16.31-2.31÷
7
5
④6760÷13+17×25 ⑤99×56
6
5
÷[(
3
4
-
2
3
)÷
5
6
].
①57.5-4.25-15.75,
=57.5-(4.25+15.75),
=57.5-20,
=37.5;

②125×
2
3
×8×
3
4

=(125×8)×(
2
3
×
3
4
),
=1000×
1
2

=500;

5
7
×16.31-2.31÷
7
5

=
5
7
×16.31-2.31×
5
7

=
5
7
×(16.31-2.31),
=
5
7
×14,
=10;

④6760÷13+17×25,
=520+425,
=945;

⑤99×56,
=(100-1)×56,
=100×56-1×56,
=5600-56,
=5544;

6
5
÷[(
3
4
-
2
3
)÷
5
6
],
=
6
5
÷[
1
12
÷
5
6
],
=
6
5
÷
1
10

=12.
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