题目内容

用递等式计算(能简算的要简算).
(1)
1
5
+
3
25
×10
(2)168.1÷(8.5-0.3)
(3)8.72+2.9+3.1+1.28
(4)
4
15
x
2
9
+
7
9
x
4
15
(1)
1
5
+
3
25
×10,
=
1
5
+
6
5

=
7
5


(2)168.1÷(8.5-0.3),
=168.1÷8.2,
=20.5;

(3)8.72+2.9+3.1+1.28,
=(8.72+1.28)+(2.9+3.1),
=10+6,
=16;

(4)
4
15
×
2
9
+
7
9
×
4
15

=
4
15
×(
2
9
+
7
9
),
=
4
15
×1,
=
4
15
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