递等式计算(能简便的要简便)①(38+56)÷124②2.5×13×0.42③5.3×12-33.46÷0.35④89÷[(25+110)×34]⑤9.34-(2.34+0.49)⑥45+45×19.

题目简介

递等式计算(能简便的要简便)①(38+56)÷124②2.5×13×0.42③5.3×12-33.46÷0.35④89÷[(25+110)×34]⑤9.34-(2.34+0.49)⑥45+45×19.

题目详情

递等式计算(能简便的要简便)
①(
3
8
+
5
6
)÷
1
24
②2.5×13×0.42③5.3×12-33.46÷0.35
8
9
÷[(
2
5
+
1
10
)×
3
4
]
⑤9.34-(2.34+0.49)
4
5
+
4
5
×19.
题型:解答题难度:中档来源:不详

答案

(1)(class="stub"3
8
+class="stub"5
6
)÷class="stub"1
24

=(class="stub"3
8
+class="stub"5
6
)×24,
=class="stub"3
8
×24+class="stub"5
6
×24,
=9+20,
=29;

(2)2.5×13×0.42,
=32.5×0.42,
=16.65;

(3)5.3×12-33.46÷0.35,
=63.6-95.6,
=-32;

(4)class="stub"8
9
÷[(class="stub"2
5
+class="stub"1
10
)×class="stub"3
4
],
=class="stub"8
9
÷[class="stub"1
2
×class="stub"3
4
],
=class="stub"8
9
×class="stub"8
3

=class="stub"64
27


(5)9.34-(2.34+0.49),
=9.34-2.34-0.49,
=7-0.49,
=6.51;

(6)class="stub"4
5
+class="stub"4
5
×19,
=class="stub"4
5
×(1+19),
=class="stub"4
5
×20,
=16.

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