计算:5123÷53+7134÷74-9145×59.-数学

题目简介

计算:5123÷53+7134÷74-9145×59.-数学

题目详情

计算:51
2
3
÷
5
3
+71
3
4
÷
7
4
-91
4
5
×
5
9
题型:填空题难度:中档来源:不详

答案

51class="stub"2
3
÷class="stub"5
3
+71class="stub"3
4
÷class="stub"7
4
-91class="stub"4
5
×class="stub"5
9

=51class="stub"2
3
×class="stub"3
5
+71class="stub"3
4
×class="stub"4
7
-91class="stub"4
5
×class="stub"5
9

=(50+class="stub"5
3
)×class="stub"3
5
+(70+class="stub"7
4
)×class="stub"4
7
-(90+class="stub"9
5
)×class="stub"5
9

=[50×class="stub"3
5
+class="stub"5
3
×class="stub"3
5
]+[70×class="stub"4
7
+class="stub"7
4
×class="stub"4
7
]-[90×class="stub"5
9
+class="stub"9
5
×class="stub"5
9
],
=[30+1]+[40+1]-[50+1],
=31+41-51,
=72-51,
=21.

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