错在哪里?135×5+4×123+123=123×(5+4)=123×9=15429-429×56=0×56=0.-数学

题目简介

错在哪里?135×5+4×123+123=123×(5+4)=123×9=15429-429×56=0×56=0.-数学

题目详情

错在哪里?
1
3
5
×5+4×1
2
3
+1
2
3
=1
2
3
×(5+4)
=1
2
3
×9
=15
4
2
9
-4
2
9
×
5
6
=
5
6
=0.
题型:解答题难度:中档来源:不详

答案

(1)×;
1class="stub"3
5
×5+4×1class="stub"2
3
+1class="stub"2
3

=1class="stub"3
5
×5+(4+1)×1class="stub"2
3

=1class="stub"3
5
×5+5×1class="stub"2
3

=(1class="stub"3
5
+1class="stub"2
3
)×5
=class="stub"49
15
×5
=class="stub"49
3


(2)×;
4class="stub"2
9
-4class="stub"2
9
×class="stub"5
6

=4class="stub"2
9
×(1-class="stub"5
6

=4class="stub"2
9
×class="stub"1
6

=class="stub"19
27

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