计算(能简便计算的要用简便方法计算)945÷(720-21×33)9.05-11.3×0.6-1.22815÷23+123×7251427÷[89×(12-38)].-数学

题目简介

计算(能简便计算的要用简便方法计算)945÷(720-21×33)9.05-11.3×0.6-1.22815÷23+123×7251427÷[89×(12-38)].-数学

题目详情

计算(能简便计算的要用简便方法计算)
945÷(720-21×33)
9.05-11.3×0.6-1.22
8
15
÷23+
1
23
×
7
25

14
27
÷[
8
9
×(
1
2
-
3
8
)].
题型:解答题难度:中档来源:不详

答案

(1)945÷(720-21×33),
=945÷(720-693),
=945÷27,
=35;

(2)9.05-11.3×0.6-1.22,
=9.05-6.78-1.22,
=9.05-(6.78+1.22),
=9.05-8,
=1.05;

(3)class="stub"8
15
÷23+class="stub"1
23
×class="stub"7
15

=class="stub"8
15
×class="stub"1
23
+class="stub"1
23
×class="stub"7
25

=(class="stub"8
15
+class="stub"7
15
)×class="stub"1
23

=1×class="stub"1
23

=class="stub"1
23


(4)class="stub"14
27
÷[class="stub"8
9
×(class="stub"1
2
-class="stub"3
8
)],
=class="stub"14
27
÷[class="stub"8
9
×class="stub"1
8
],
=class="stub"14
27
÷class="stub"1
9

=class="stub"14
27
×9,
=class="stub"14
3

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