3.计算(√x+√x-1)(√x-√x-1)的值是( ).A.2 B.3 C.4 D.1
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3.计算(√x+√x-1)(√x-√x-1)的值是( ).A.2 B.3 C.4 D.1
3.计算(√x+√x-1)(√x-√x-1)的值是( ).A.2 B.3 C.4 D.1
3.计算(√x+√x-1)(√x-√x-1)的值是( ).A.2 B.3 C.4 D.1
选D,直接展开,原式=(√x)平方-(√x-1)平方=1