用递等式计算.(怎样简算怎样算)(1)54×52+54×32(2)13÷5+23×15(3)(47+12)×28(4)[1-(37+514)]÷17.-数学

题目简介

用递等式计算.(怎样简算怎样算)(1)54×52+54×32(2)13÷5+23×15(3)(47+12)×28(4)[1-(37+514)]÷17.-数学

题目详情

用递等式计算.(怎样简算怎样算)
(1)
5
4
×
5
2
+
5
4
×
3
2

(2)
1
3
÷5+
2
3
×
1
5

(3)(
4
7
+
1
2
)×28
(4)[1-(
3
7
+
5
14
)]÷
1
7
题型:解答题难度:中档来源:不详

答案

(1)class="stub"5
4
×class="stub"5
2
+class="stub"5
4
×class="stub"3
2

=(class="stub"5
2
+class="stub"3
2
)×class="stub"5
4

=4×class="stub"5
4

=5;
(2)class="stub"1
3
÷5+class="stub"2
3
×class="stub"1
5

=class="stub"1
3
×
class="stub"1
5
+class="stub"2
3
×class="stub"1
5

=(class="stub"1
3
+class="stub"2
3
)×class="stub"1
5

=1×class="stub"1
5

=class="stub"1
5

(3)(class="stub"4
7
+class="stub"1
2
)×28,
=class="stub"4
7
×
28+class="stub"1
2
×28,
=16+14,
=30;
(4)[1-(class="stub"3
7
+class="stub"5
14
)]÷class="stub"1
7

=[1-class="stub"11
14
]×7,
=class="stub"3
14
×7,
=1class="stub"1
2

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