问题 解答题
正确计算巧又细.
(1)
5
6
×
5
9
+
5
9
×
1
6

(2)3-
6
13
÷
9
26
-
2
3

(3)(0.75-
3
16
)×(
2
9
+
1
3
答案

解(1)

5
6
×
5
9
+
5
9
×
1
6

=(

5
6
+
1
6
)×
5
9

=1×

5
9

=

5
9

(2)3-

6
13
÷
9
26
-
2
3

=3-

4
3
-
2
3

=3-(

4
3
+
2
3
),

=3-2,

=1;

(3)(0.75-

3
16
)×(
2
9
+
1
3
),

=

9
16
×
5
9

=

5
16

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