下面各题,怎样算简便就怎样算. ①5/6×11+5/6 ②120+290÷58×16 ③(2/3-2/5)×(1/8+1/12) ④9/8÷[3/4-(7/16-1/4)].

问题描述:

下面各题,怎样算简便就怎样算.

5
6
×11+
5
6

②120+290÷58×16
③(
2
3
-
2
5
)×(
1
8
+
1
12

9
8
÷[
3
4
-(
7
16
-
1
4
)].

5
6
×11+
5
6

=(11+1)×
5
6

=12×
5
6

=10;
②120+290÷58×16,
=120+290÷29÷2×16,
=120+5×16,
=120+80.
=200;
③(
2
3
-
2
5
)×(
1
8
+
1
12
),
=
4
15
×
5
24

=
1
18

9
8
÷[
3
4
-(
7
16
-
1
4
)],
=
9
8
÷[
3
4
+
1
4
-
7
16
],
=
9
8
÷[1-
7
16
],
=
9
8
÷
9
16

=
9
8
×
16
9

=2.