题目内容

怎样简便怎样算.
4.52-0.74-0.26  
7
4
×
5
8
+
1
4
÷
8
5

4.8×99+4.8
(2.5-2.5×60%)÷4     
2
15
×3+
13
15
÷
1
3
     
2
7
-
6
13
×
2
7
(1)4.52-0.74-0.26,
=4.52-(0.74+0.26),
=4.52-1,
=3.52;

(2)
7
4
×
5
8
+
1
4
÷
8
5

=
7
4
×
5
8
+
1
4
×
5
8

=(
7
4
+
1
4
)×
5
8

=2×
5
8

=
5
4


(3)4.8×99+4.8,
=4.8×(99+1),
=4.8×100,
=480;

(4)(2.5-2.5×60%)÷4,
=[2.5×(1-0.6)]÷4,
=[2.5×0.4]÷4,
=1÷4,
=0.25;

(5)
2
15
×3+
13
15
÷
1
3

=
2
15
×3+
13
15
×3,
=(
2
15
+
13
15
)×3,
=1×3,
=3;

(6)
2
7
-
6
13
×
2
7

=
2
7
×(1-
6
13
),
=
2
7
×
7
13

=
2
13
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