√a²-2ab+b²的值是几(求过程)求值√a²-2ab+b²
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√a²-2ab+b²的值是几(求过程)求值√a²-2ab+b²
√a²-2ab+b²的值是几(求过程)
求值√a²-2ab+b²
√a²-2ab+b²的值是几(求过程)求值√a²-2ab+b²
√a²-2ab+b²
=√(a-b)²
=|a-b|