试题:
0.25×19+5×
1
4

2
15
×13×30
1
7
×
3
4
+
2
7
×
1
8
+
6
7

3
5
×7.6+2.4×0.6.

答案:

我来补答
(1)0.25×19+5×
1
4

=
1
4
×19+5×
1
4

=
1
4
×(19+5),
=
1
4
×24,
=6;

(2)
2
15
×13×30
=
2
15
×30×13,
=4×13,
=52;

(3)
1
7
×
3
4
+
2
7
×
1
8
+
6
7

=
1
7
×
3
4
+
1
7
×
1
4
+
6
7

=
1
7
×(
3
4
+
1
4
)+
6
7

=
1
7
+
6
7

=1;

(4)
3
5
×7.6+2.4×0.6.
=0.6×7.6+2.4×0.6,
=0.6×(7.6+2.4),
=0.6×10,
=6.
 
 
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