用递等式计算712÷9+19×512[45-0÷(13+25)]×58(3.8-1.8÷2)×0.32÷23-23÷2(115+217)×15×17(15-15×45)×724.-数学

题目简介

用递等式计算712÷9+19×512[45-0÷(13+25)]×58(3.8-1.8÷2)×0.32÷23-23÷2(115+217)×15×17(15-15×45)×724.-数学

题目详情

用递等式计算
7
12
÷9+
1
9
×
5
12

[
4
5
-0÷(
1
3
+
2
5
)]×
5
8
(3.8-1.8÷2)×0.3
2
3
-
2
3
÷2
1
15
+
2
17
)×15×17
(15-15×
4
5
)×
7
24
题型:解答题难度:中档来源:不详

答案

(1)class="stub"7
12
÷9+class="stub"1
9
×class="stub"5
12

=class="stub"7
12
×class="stub"1
9
+class="stub"1
9
×class="stub"5
12

=(class="stub"7
12
+class="stub"5
12
)×class="stub"1
9

=1×class="stub"1
9

=class="stub"1
9


(2)[class="stub"4
5
-0÷(class="stub"1
3
+class="stub"2
5
)]×class="stub"5
8

=class="stub"4
5
×class="stub"5
8

=class="stub"1
2


(3)(3.8-1.8÷2)×0.3,
=(3.8-0.9)×0.3,
=2.9×0.3,
=0.87;

(4)2÷class="stub"2
3
-class="stub"2
3
÷2,
=3-class="stub"1
3

=2class="stub"2
3


(5)(class="stub"1
15
+class="stub"2
17
)×15×17,
=class="stub"1
15
×15×17+class="stub"2
17
×15×17

=17+30,
=47;

(6)(15-15×class="stub"4
5
)×class="stub"7
24

=(15-12)×class="stub"7
24

=3×class="stub"7
24

=class="stub"7
8

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