问题 解答题
用脱式计算下面各题(能简算的要简算).
1
12
+
1
8
)×24
3
4
×99+0.75
2-
6
13
÷
9
26
-
2
3
5
8
÷[
1
3
+(
5
6
-
3
4
)].
答案

①(

1
12
+
1
8
)×24,

=

1
12
×24+
1
8
×24,

=2+3,

=5;

3
4
×99+0.75,

=0.75×99+0.75,

=0.75×(99+1),

=0.75×100,

=75;

③2-

6
13
÷
9
26
-
2
3

=2-1

1
3
-
2
3

=2-(1

1
3
+
2
3
),

=2-2,

=0;

5
8
÷[
1
3
+(
5
6
-
3
4
)],

=

5
8
÷[
1
3
+
1
12
],

=

5
8
÷
5
12

=1.5.

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