试题 试卷
题型:单选题 题类:模拟题 难易度:普通
2017年辽宁省辽南协作体高考数学模拟试卷(理科)(5月份)
(sin )﹣2+(sin )﹣2= ×1×2;
(sin )﹣2+(sin )﹣2+(sin )﹣2+sin( )﹣2= ×2×3;
(sin )﹣2+(sin )﹣2+(sin )﹣2+…+sin( )﹣2= ×3×4;
(sin )﹣2+(sin )﹣2+(sin )﹣2+…+sin( )﹣2= ×4×5;
…
照此规律,
(sin )﹣2+(sin )﹣2+(sin )﹣2+…+(sin )﹣2={#blank#}1{#/blank#}.
观察上图,由此得出第5个四面体数为{#blank#}1{#/blank#}(用数字作答);第 个四面体数为{#blank#}2{#/blank#}.
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