题目内容

简算
7
9
÷2
1
5
+
2
9
×
5
11
6
1
4
-3.5+3.75-5
1
2
9
5
6
×4.25+4
1
4
×
1
6
-4
1
4
×2.
(1)
7
9
÷2
1
5
+
2
9
×
5
11

=
7
9
×
5
11
+
2
9
×
5
11

=
5
11
×(
7
9
+
2
9
),
=
5
11
×1,
=
5
11


(2)6
1
4
-3.5+3.75-5
1
2

=6
1
4
+3.75-3.5-5
1
2

=(6.25+3.75)-(3.5+5.5),
=10-9,
=1;

(3)9
5
6
×4.25+4
1
4
×
1
6
-4
1
4
×2,
=9
5
6
×4
1
4
+4
1
4
×
1
6
-4
1
4
×2,
=
17
4
×(9
5
6
+
1
6
-2),
=
17
4
×8,
=34.
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