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2道英语题(加分)1.The three sides of a triangle are of lengths 1,m,

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2道英语题(加分)
1.The three sides of a triangle are of lengths 1,m,and n,respectively.The numbers 1,m,and n are positive integers,1≤m≤n.Take n=9 and find the number of different triangles of the described kind.
2.To number the pages of a bulky volume the printer used 1890 digits.How many pages has the volume?
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2道英语题(加分)1.The three sides of a triangle are of lengths 1,m,
1.三角形三条边长各为1,m,n(1,m,n为正整数,1≤m≤n),当n=9时,列出符合要求的三角形.
答:只有一个,m=9,n=9时符合,它是等腰三角形.
2.数出一本有1890张纸的书有多少页?
答:这很简单,1890*2=3780(张).
保证正确!