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