题目内容

用递等式计算,能简算的要简算.
(1)8470-104×65
(2)1.28+9.8+9.72+10.2
(3)168.1÷(4.3×2-0.4)
(4)
5
7
×
1
7
+
6
7
÷
7
5

(5)(
4
5
+
1
4
)×20.

(1)8470-104×65,
=8470-6760,
=1710;

(2)1.28+9.8+9.72+10.2,
=(1.28+9.72)+(9.8+10.2),
=11+20,
=31;

(3)168.1÷(4.3×2-0.4),
=168.1÷(8.6-0.4),
=168.1÷8.2,
=20.5;

(4)
5
7
×
1
7
+
6
7
÷
7
5

=
5
7
×
1
7
+
6
7
×
5
7

=
5
7
×(
1
7
+
6
7
),
=
5
7
×1,
=
5
7


(5)(
4
5
+
1
4
)×20,
=
4
5
×20+
1
4
×20,
=16+5,
=21.
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