用递等式计算.(1)1292+540÷18×24(2)1.05×(3.8-0.8)÷6.3(3)920÷[12×(25+45)](4)[1-(14+38)]÷1516.-数学

题目简介

用递等式计算.(1)1292+540÷18×24(2)1.05×(3.8-0.8)÷6.3(3)920÷[12×(25+45)](4)[1-(14+38)]÷1516.-数学

题目详情

用递等式计算.
(1)1292+540÷18×24(2)1.05×(3.8-0.8)÷6.3
(3)
9
20
÷[
1
2
×(
2
5
+
4
5
)]
(4)[1-(
1
4
+
3
8
)]÷
15
16
题型:解答题难度:中档来源:不详

答案

(1)1292+540÷18×24,
=1292+30×24,
=1292+720,
=2012;

(2)1.05×(3.8-0.8)÷6.3,
=1.05×3÷6.3,
=3.15÷6.3,
=0.5;

(3)class="stub"9
20
÷[class="stub"1
2
×(class="stub"2
5
+class="stub"4
5
)],
=class="stub"9
20
÷[class="stub"1
2
×class="stub"6
5
],
=class="stub"9
20
÷class="stub"3
5

=class="stub"3
4


(4)[1-(class="stub"1
4
+class="stub"3
8
)]÷class="stub"15
16

=[1-class="stub"5
8
class="stub"15
16

=class="stub"3
8
÷class="stub"15
16

=class="stub"2
5

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