1、a²+9b²+6ab2、(a-2b)²+8ab3、(x-y)²-4(x-y-1)4、已知a、b、c是△ABC的三条边长,试判断a²-(b+c)²是整数还是负数.5、I received an _____(invite)letter from Daniel yesterday.6、We a
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![1、a²+9b²+6ab2、(a-2b)²+8ab3、(x-y)²-4(x-y-1)4、已知a、b、c是△ABC的三条边长,试判断a²-(b+c)²是整数还是负数.5、I received an _____(invite)letter from Daniel yesterday.6、We a](/uploads/image/z/6122231-71-1.jpg?t=1%E3%80%81a%26sup2%3B%2B9b%26sup2%3B%2B6ab2%E3%80%81%EF%BC%88a-2b%EF%BC%89%26sup2%3B%2B8ab3%E3%80%81%EF%BC%88x-y%EF%BC%89%26sup2%3B-4%EF%BC%88x-y-1%EF%BC%894%E3%80%81%E5%B7%B2%E7%9F%A5a%E3%80%81b%E3%80%81c%E6%98%AF%E2%96%B3ABC%E7%9A%84%E4%B8%89%E6%9D%A1%E8%BE%B9%E9%95%BF%2C%E8%AF%95%E5%88%A4%E6%96%ADa%26sup2%3B-%EF%BC%88b%2Bc%EF%BC%89%26sup2%3B%E6%98%AF%E6%95%B4%E6%95%B0%E8%BF%98%E6%98%AF%E8%B4%9F%E6%95%B0.5%E3%80%81I+received+an+_____%EF%BC%88invite%EF%BC%89letter+from+Daniel+yesterday.6%E3%80%81We+a)
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