题目内容

怎样算简便就怎样算.
4
9
×
1
5
÷
4
5

(15-14×
4
7
)×
8
21

4
5
÷[(
1
3
+
2
5
)×
4
11
];
1
8
×58+42÷8;
7
2
×
5
8
-
3
2
÷
8
5
(1)
4
9
×
1
5
÷
4
5

=
4
9
×
1
5
×
5
4

=
1
9

(2)(15-14×
4
7
)×
8
21

=(15-8)×
8
21

=7×
8
21

=
8
3

(3)
4
5
÷[(
1
3
+
2
5
)×
4
11
]
=
4
5
÷[
11
15
×
4
11
]
=
4
5
÷
4
15

=
4
5
×
15
4

=3
(4)
1
8
×58+42÷8
=
1
8
×58+42×
1
8

=
1
8
×(58+42)
=
1
8
×100
=12.5
(5)
7
2
×
5
8
-
3
2
÷
8
5

=
7
2
×
5
8
-
3
2
×
5
8

=(
7
2
-
3
2
)×
5
8

=2×
5
8

=
5
4

(6)
3
4
×40%+0.75×
3
5

=
3
4
×
2
5
+
3
4
×
3
5

=
3
4
×(
2
5
+
3
5

=
3
4
×1
=
3
4
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