试题:
用简便方法计算
(1)6.35-
5
7
+4.65-
2
7
=
(2)
8
13
÷
7+
1
7
×
5
13
=
(3)
3
4
×
0.25×
4
3
×4=

答案:

我来补答
(1)6.35-
5
7
+4.65-
2
7

=6.35+4.65-(
5
7
+
2
7
),
=11-1,
=10;

(2)
8
13
÷
7+
1
7
×
5
13
=
=
8
13
×
1
7
+
1
7
×
5
13

=(
8
13
+
5
13
)×
1
7

=1×
1
7

=
1
7


(3)
3
4
×
0.25×
4
3
×4
=(
3
4
×
4
3
)×(0.25×4),
=1×1,
=1.
 
 
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