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一个非负数才有算术平方根.一个非负数的算术平方根仍是一个非负数.运用这些性质可以巧解下列问题.一、求代数式的值
A nonnegative number has an arithmetic square root.A nonnegative arithmetic square root is still a nonnegative number.Using these properties can solve the following questions.First, find the algebraic value