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)57×17+67÷75(5)(45+14)×20.-数

题目简介

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)57×17+67÷75(5)(45+14)×20.-数

题目详情

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.
题型:解答题难度:中档来源:不详

答案


(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)class="stub"5
7
×class="stub"1
7
+class="stub"6
7
÷class="stub"7
5

=class="stub"5
7
×class="stub"1
7
+class="stub"6
7
×class="stub"5
7

=class="stub"5
7
×(class="stub"1
7
+class="stub"6
7
),
=class="stub"5
7
×1,
=class="stub"5
7


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

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