题目内容

计算.
0.25×[(2.8+4.4)÷1.2]
14
15
×
1
4
-
2
15
÷4
3
5
÷[(
7
9
+
1
3
)×
3
2
]
3
7
×
1
3
+
4
7
÷3.
(1)0.25×[(2.8+4.4)÷1.2]
=0.25×[7.2÷1.2]
=0.25×6
=1.5;


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

=(
14
15
-
2
15
)×
1
4

=
12
15
×
1
4

=
1
5


(3)
3
5
÷[(
7
9
+
1
3
)×
3
2
]
=
3
5
÷[
10
9
×
3
2
]
=
3
5
×
3
5

=
9
25



(4)
3
7
×
1
3
+
4
7
÷3
=
3
7
×
1
3
+
4
7
×
1
3

=(
3
7
+
4
7
)×
1
3

=
1
3
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