题目内容

计算下列各题,能简便的要简便计算.
1
5
+
4
5
÷
2
5

6.75×
2
5
+3.25÷
5
2

11
14
-
5
7
+
5
28
)×28
(0.75-
3
16
)×(
2
9
+
1
3
(1)
1
5
+
4
5
÷
2
5

=
1
5
+
4
5
×
5
2

=
1
5
+2,
=2
1
5


(2)6.75×
2
5
+3.25÷
5
2

=6.75×
2
5
+3.25×
2
5

=(6.75×+3.25)×
2
5

=10×
2
5

=4;

(3)(
11
14
-
5
7
+
5
28
)×28,
=
11
14
×28-
5
7
×28+
5
28
×28,
=22-20+5,
=7;

(4)(0.75-
3
16
)×(
2
9
+
1
3
),
=(
3
4
-
3
16
)×(
2
9
+
3
9
),
=
9
16
×
5
9

=
5
16
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