15÷
4
5
+15÷
1
5
=15÷(
4
5
+
1
5
)=15
×
×
.(判斷對錯)
分析:通過觀察,此題應(yīng)先算除法,再算加法.而原題中錯用了除法的性質(zhì),除法的性質(zhì)應(yīng)是除數(shù)相同,而不是被除數(shù)相同,即(a+b)÷c=a÷c+b÷c.
解答:解:15÷
4
5
+15÷
1
5

=15×
5
4
+15×5
=
75
4
+75
=18
3
4
+75
=93
3
4

故答案為:×.
點評:此題考查了學(xué)生對除法運算性質(zhì)的掌握與運用.
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