选择合理的方法计算.①5400-2940÷28×27②(14-110÷2)÷310③9×(49+114)+514④(115+217)×15×17.-数学

题目简介

选择合理的方法计算.①5400-2940÷28×27②(14-110÷2)÷310③9×(49+114)+514④(115+217)×15×17.-数学

题目详情

选择合理的方法计算.
①5400-2940÷28×27
②(
1
4
-
1
10
÷2)÷
3
10

③9×(
4
9
+
1
14
)+
5
14

④(
1
15
+
2
17
)×15×17.
题型:解答题难度:中档来源:不详

答案

①5400-2940÷28×27,
=5400-105×27,
=5400-2835,
=2565;

②(class="stub"1
4
-class="stub"1
10
÷2)÷class="stub"3
10

=(class="stub"1
4
-class="stub"1
20
)÷class="stub"3
10

=class="stub"1
5
×class="stub"10
3

=class="stub"2
3


③9×(class="stub"4
9
+class="stub"1
14
)+class="stub"5
14

=9×class="stub"4
9
+9×class="stub"1
14
+class="stub"5
14

=4+class="stub"9
14
+class="stub"5
14

=4+(class="stub"9
14
+class="stub"5
14
),
=4+1,
=5;

④(class="stub"1
15
+class="stub"2
17
)×15×17,
=(class="stub"1
15
+class="stub"2
17
)×(15×17),
=class="stub"1
15
×(15×17)+class="stub"2
17
×(15×17),
=(class="stub"1
15
×15)×17+(class="stub"2
17
×17)×15,
=1×17+2×15,
=17+30,
=47.

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