问题 解答题
计算下面各题,能简算的要简算.
3
8
+
5
8
×
2
5
+
3
4
26×(
5
13
-
2
15
)÷
1
30
4
9
-
5
12
+
2
3
)÷
1
36
16
19
×
5
17
+
12
19
×
16
17
+3÷19.
答案

3
8
+
5
8
×
2
5
+
3
4

=

3
8
+
1
4
+
3
4

=

3
8
+(
1
4
+
3
4
),

=1

3
8

②26×(

5
13
-
2
15
)÷
1
30

=26×30×

5
13
-26×30×
2
15

=300-104,

=196;

③(

4
9
-
5
12
+
2
3
)÷
1
36

=(

4
9
-
5
12
+
2
3
)×36,

=

4
9
×36-
5
12
×36+
2
3
×36,

=16-15+24,

=25;

16
19
×
5
17
+
12
19
×
16
17
+3÷19,

=

80
323
+
192
323
+
3
19

=

272
323
+
3
19

=

272
323
+
51
323

=

323
323

=1.

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