问题 解答题
计算下面各题,能简便计算的请简便计算.
5
12
+
5
8
)÷
5
8
+
1
3

6.5×0.64-6.5×0.54+6.5×90%
4
7
+
1
5
-
3
7
+
4
5
=
答案

(1)(

5
12
+
5
8
)÷
5
8
+
1
3

=

25
24
×
8
5
+
1
3

=

5
3
+
1
3

=2;

(2)6.5×0.64-6.5×0.54+6.5×90%,

=6.5×0.64-6.5×0.54+6.5×0.9,

=6.5×(0.64-0.54+0.9),

=6.5×1,

=6.5;

(3)

4
7
+
1
5
-
3
7
+
4
5

=(

4
7
-
3
7
)+(
1
5
+
4
5
),

=

1
7
+1,

=1

1
7

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