3.计算(√x+√x-1)(√x-√x-1)的值是( ).A.2 B.3 C.4 D.1
人气:390 ℃ 时间:2020-05-12 10:51:59
解答
选D,直接展开,原式=(√x)平方-(√x-1)平方=1
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