题目内容

计算下面各题,能简算的要简算.
2
3
+
1
2
÷3)÷
3
4
2.8×
1
4
+7.2×25%
4
5
×
4
7
×
5
4
-
1
3
7
9
÷
12
5
+
2
9
×
5
12
1
6
+
3
4
×
2
3
÷2
5
9
×6+
4
9
÷
1
6
(1)(
2
3
+
1
2
÷3)÷
3
4

=(
2
3
+
1
6
)÷
3
4

=
5
6
÷
3
4

=
10
9


(2)2.8×
1
4
+7.2×25%,
=(2.8+7.2)×25%,
=10×0.25,
=2.5;

(3)
4
5
×
4
7
×
5
4
-
1
3

=
4
5
×
5
4
×
4
7
-
1
3

=1×
4
7
-
1
3

=
4
7
-
1
3

=
5
21


(4)
7
9
÷
12
5
+
2
9
×
5
12

=
7
9
×
5
12
+
2
9
×
5
12

=(
7
9
+
2
9
)×
5
12

=1×
5
12

=
5
12


(5)
1
6
+
3
4
×
2
3
÷2,
=
1
6
+
1
2
÷2,
=
1
6
+
1
4

=
5
12


(6)
5
9
×6+
4
9
÷
1
6

=
5
9
×6+
4
9
×6,
=(
5
9
+
4
9
)×6,
=1×6,
=6.
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