问题 解答题
下面各题怎样算简便就怎样算
5
7
×16-2÷
7
5

12
13
×(
5
2
-
1
3

[6.85-(0.65+0.7)]÷2.5
3
7
+
3
5
)×7+
4
5
答案

(1)

5
7
×16-2÷
7
5

=

5
7
×16-2×
5
7

=(16-2)×

5
7

=14×

5
7

=10;

(2)

12
13
×(
5
2
-
1
3
),

=

12
13
×
5
2
-
12
13
×
1
3

=

30
13
-
4
13

=2;

(3)[6.85-(0.65+0.7)]÷2.5,

=[6.85-1.35]÷2.5,

=5.5÷2.5,

=2.2;

(4)(

3
7
+
3
5
)×7+
4
5

=

3
7
×7+
3
5
×
7+
4
5

=3+(

21
5
+
4
5
),

=3+5,

=8.

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