怎样算简便就怎样算.①9+8÷26+27÷39②0.8×[13-(3.12+5.28)]③ 4 9 ÷[ 4 5

2025-06-21 05:54:37
推荐回答(1个)
回答1:

①9+8÷26+27÷39,
=9+
8
26
+
27
39

=9+
4
13
+
9
13

=9+(
4
13
+
9
13
),
=10;

②0.8×[13-(3.12+5.28)],
=0.8×[13-8.4],
=0.8×4.6,
=3.68;

4
9
÷[
4
5
-(
1
3
-
1
5
)],
=
4
9
÷[
4
5
+
1
5
-
1
3
],
=
4
9
÷
2
3

=
4
9
×
3
2

=
2
3


6
17
+(
13
14
+
13
17
)×
11
13
+
3
14

=
6
17
+
13
14
×
11
13
+
13
17
×
11
13
+
3
14

=
6
17
+
11
14
+
11
17
+
3
14

=(
6
17
+
11
17
)+(
11
14
+
3
14
),
=1+1,
=2.