(1+12)×(1-12)×(1+13)×(1-13)×…×(1+19)×(1-19)=______.-数学

题目简介

(1+12)×(1-12)×(1+13)×(1-13)×…×(1+19)×(1-19)=______.-数学

题目详情

(1+
1
2
)×(1-
1
2
)
×(1+
1
3
)
×(1-
1
3
)
×…×(1+
1
9
)×(1-
1
9
)
=______.
题型:解答题难度:中档来源:不详

答案

(1+class="stub"1
2
)×(1-class="stub"1
2
)×(1+class="stub"1
3
)×(1-class="stub"1
3
)×…×(1+class="stub"1
9
)×(1-class="stub"1
9

=class="stub"1
2
×class="stub"3
2
×class="stub"2
3
×class="stub"4
3
×…×class="stub"8
9
×class="stub"10
9

=class="stub"1
2
×class="stub"10
9

=class="stub"5
9

故答案为:class="stub"5
9

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