题目内容

怎样简便怎样算
3-
1
9
×1
1
2
+
5
6
0.9-(0.15+0.35÷
5
7

7.25-3
3
7
+3.75-6
4
7
(2-
3
4
×
4
5
)÷(
1
12
+
4
15
①3-
1
9
×1
1
2
+
5
6

=3-
1
9
×
3
2
+
5
6

=3-
1
6
+
5
6

=2
5
6
+
5
6

=3
2
3

②0.9-(0.15+0.35÷
5
7

=0.9-(0.15+
7
20
÷
5
7

=0.9-(0.15+
7
20
×
7
5

=0.9-(0.15+0.49)
=0.9-0.64
=0.26;
③7.25-3
3
7
+3.75-6
4
7

=(7.25+3.75)-(3
3
7
+6
4
7

=11-10
=1;
④(2-
3
4
×
4
5
)÷(
1
12
+
4
15

=(2-
3
5
)÷
7
20

=
7
5
×
20
7

=4.
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