题目内容

怎样算简便就怎样算:
6
7
÷[(
4
7
-
1
2
)×
2
5
];
15.28-3.99-9.01;
14
15
×
1
4
-
2
15
÷4.
(1)
6
7
÷[(
4
7
-
1
2
)×
2
5
],
=
6
7
÷[
1
14
×
2
5
],
=
6
7
÷
1
35

=
6
7
×35,
=30;

(2)15.28-3.99-9.01,
=15.28-(3.99+9.01),
=15.28-13,
=2.28;

(3)
14
15
×
1
4
-
2
15
÷4,
=
14
15
×
1
4
-
2
15
×
1
4

=(
14
15
-
2
15
)×
1
4

=
4
5
×
1
4

=
1
5
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