10姐姐和七岁的妹妹适合养什么宠物？ 妹妹今年七岁了，姐姐对妹妹说，等你长到十岁时我正好十五岁，喂...
1/7\uff0c\u8fd8\u6bd4\u59b9\u59b9\u591a10\u53ea\uff0c\u59d0\u59d0\u548c\u59b9\u59b9\u5404\u517b\u4e86\u591a\u5c11\u53ea\u5154\u9898\u76ee\uff1a\u59d0\u59b9\u4fe9\u517b\u5154120\u53ea,\u5982\u679c\u59d0\u59d0\u5356\u63891/7,\u8fd8\u6bd4\u59b9\u59b9\u591a\u5341\u53ea,\u59d0\u59d0\u548c\u59b9\u59b9\u5404\u517b\u4e86\u591a\u5c11\u53ea\u5154?
\u89e3\u9898\uff1a
\u8bbe\u59d0\u59d0\u6709\u5154\u5b50x\u53ea,\u5219\u59b9\u59b9\u6709\u5154\u5b50\uff08120-x\uff09\u53ea.
\uff081-1/7\uff09*x-\uff08120-x\uff09=10
6/7*x-120+x=10
13/7*x=130
x=70
\u56e0\u4e3a\u59b9\u59b9\u6709\u5154\u5b50\uff08120-x\uff09\u53ea,\u6240\u4ee5\u59b9\u59b9\u6709\u5154\u5b50120-70=50\uff08\u53ea\uff09.
\u7b54\uff1a\u59d0\u59d0\u6709\u5154\u5b5070\u53ea,\u59b9\u59b9\u6709\u5154\u5b5050\u53ea.
12\u5c81\u554a
一般来说，小狗，小猫，兔子，仓鼠，都是小孩子宠物的首选。
当然，相关的知识要先让孩子们系统学习下，
毕竟宠物是很脏的。
绛旓細Dear Sir or Madam,Hello.This is Li Hua from Beijing Xinhua High School.I am writing in the hope that I can obtain a chance to further my study in computer science at your university.I am a girl and was born in June,1993.I am studying in Beijing Xinhua High School and ...
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