3.625-2.25+
3
8
-
7
4
8
15
×[
5
6
÷(
7
9
-
1
3
)]
[1-(
1
4
+
3
8
)]÷0.25×4
7
5
7
÷4+0.25×3
2
7
+
1
4
(1)3.625-2.25+
3
8
-
7
4
,
=(3.625+
3
8
)-(2.25+
7
4
),
=4-4,
=0;

(2)
8
15
×[
5
6
÷(
7
9
-
1
3
)]
,
=
8
15
×[
5
6
÷
4
9
],
=
8
15
×
15
8
,
=1;

(3)[1-(
1
4
+
3
8
)]÷0.25×4
,
=[1-
5
8
]÷0.25×4,
=
3
8
×4×4,
=
3
2
×4,
=6;

(4)7
5
7
÷4+0.25×3
2
7
+
1
4
,
=7
5
7
×
1
4
+
1
4
×1+3
2
7
×
1
4

=(7
5
7
+1+3
2
7
)×
1
4
,
=12×
1
4
,
=3.
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2
5
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10
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3
5
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5
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