用递递等式计算.4÷45-45÷4105×13-270÷1813÷[(23+15)×113].-数学

题目简介

用递递等式计算.4÷45-45÷4105×13-270÷1813÷[(23+15)×113].-数学

题目详情

用递递等式计算.
4
5
-
4
5
÷4 
105×13-270÷18  
1
3
÷[(
2
3
+
1
5
)×
1
13
].
题型:解答题难度:中档来源:不详

答案

(1)4÷class="stub"4
5
-class="stub"4
5
÷4,
=4×class="stub"5
4
-class="stub"4
5
×class="stub"1
4

=5-class="stub"1
5

=class="stub"24
5


(2)105×13-270÷18  
=1365-15,
=1350;

(3)class="stub"1
3
÷[(class="stub"2
3
+class="stub"1
5
)×class="stub"1
13
],
=class="stub"1
3
÷[(class="stub"10
15
+class="stub"3
15
)×class="stub"1
13
],
=class="stub"1
3
÷[class="stub"13
15
×class="stub"1
13
],
=class="stub"1
3
÷class="stub"1
15

=class="stub"1
3
×15,
=5.

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