试题 试卷
题型:填空题 题类:常考题 难易度:普通
2015-2016学年河南省郑州市高二下学期期末数学试卷(理科)
+ =1
+ + + =12
=39
…
则当m<n且m,n∈N时, =(最后结果用m,n表示)
(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#}.
将全体正整数排成一个三角形数阵:按照以上排列的规律,第n行(n≥3)从左向右的第3个数为{#blank#}1{#/blank#}
……
若某数 按上述规律展开后,发现等式右边含有“ ”这个数,则 {#blank#}1{#/blank#}.
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