问题 解答题
脱式计算.
①375+450÷18×25
②24×(
1
2
+
1
3
-
1
6
③9.7÷1.25÷0.8
4
5
÷[
5
7
×(
3
5
-
1
4
)].
答案

①375+450÷18×25,

=375+25×25,

=375+625,

=1000;

②24×(

1
2
+
1
3
-
1
6
),

=24×

1
2
+24×
1
3
-24×
1
6

=12+8-4,

=20-4,

=16;

③9.7÷1.25÷0.8,

=9.7÷(1.25×0.8),

=9.7÷1,

=9.7;

4
5
÷[
5
7
×(
3
5
-
1
4
)],

=

4
5
÷[
5
7
×
7
20
],

=

4
5
÷
1
4

=

16
5

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