问题 解答题
脱式计算.(能简算的要简算)
1
9
÷(
1
3
-
1
9
8
9
×[
3
4
-(
7
16
-
1
4
)]
5
8
÷[
2
11
×(
1
5
+
1
6
)]
7
9
÷
11
5
+
2
9
×
5
11
5.58-
3
5
+5.42-
2
5
999
8
9
+99
8
9
+9
8
9
+
1
3
答案

(1)

1
9
÷(
1
3
-
1
9

=

1
9
÷
2
9

=

1
2

(2)

8
9
×[
3
4
-(
7
16
-
1
4
)]

=

8
9
×[
3
4
+
1
4
-
7
16
],

=

8
9
×[1-
7
16
],

=

8
9
×
9
16

=

1
2

(3)

5
8
÷[
2
11
×(
1
5
+
1
6
)]

=

5
8
÷[
2
11
×
11
30
],

=

5
8
×15,

=9

3
8

(4)

7
9
÷
11
5
+
2
9
×
5
11

=

7
9
×
5
11
+
2
9
×
5
11

=(

7
9
+
2
9
)×
5
11

=1×

5
11

=

5
11

(5)5.58-

3
5
+5.42-
2
5

=(5.58+5.42)-(

3
5
+
2
5
),

=11-1,

=10;

(6)999

8
9
+99
8
9
+9
8
9
+
1
3

=1000+100+10+

1
3
-
1
9
-
1
9
-
1
9

=1110+(

1
3
-
1
9
×
3),

=1110+(

1
3
-
1
3
).

=1110+0,

=1110.

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