用递等式计算:(能简算的要简算)①2.1×0.5÷4.2;②4080÷12-24×1.5;③24×(14+23-16);④25÷〔58×(910+16)〕.-数学

题目简介

用递等式计算:(能简算的要简算)①2.1×0.5÷4.2;②4080÷12-24×1.5;③24×(14+23-16);④25÷〔58×(910+16)〕.-数学

题目详情

用递等式计算:(能简算的要简算)
①2.1×0.5÷4.2;
②4080÷12-24×1.5;
③24×(
1
4
+
2
3
-
1
6
);
2
5
÷〔
5
8
×(
9
10
+
1
6
)〕.
题型:解答题难度:中档来源:不详

答案

①2.1×0.5÷4.2,
=1.05÷4.2,
=0.25;

②4080÷12-24×1.5,
=340-36,
=304;

③24×(class="stub"1
4
+class="stub"2
3
-class="stub"1
6
),
=24×class="stub"1
4
+24×class="stub"2
3
-24×class="stub"1
6

=6+16-4,
=22-4,
=18;

class="stub"2
5
÷[class="stub"5
8
×(class="stub"9
10
+class="stub"1
6
)],
=class="stub"2
5
÷[class="stub"5
8
×class="stub"16
15
],
=class="stub"2
5
÷class="stub"2
3

=class="stub"3
5

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