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实数是历年中考的一个热点,现以近年中考试题为例,说明各热点题型的解答策略.一、已知一个数,求它的平方根、算术平方根、立方根:例1 125的平方根是____A.5 B.-5 C.±5 D.25216的算术平方根是()A.±4 B.4 C.±2 D.2364的立方根是()A.4 B.-4 C.8 D.-8解析:1根据平方根的意义,知(±5)2=25,所以25的平方根是±5.2表示16的算术平方根.只有非负数有算术平方根,且其算术平
The real number is a hot spot in the mid-year examinations, the test questions in recent years, for example, to explain the answer questions of the hot questions. First, known a number, find its square root, arithmetical square root, cube root: Example 1 125 square root is ____A .5 B.-5 C. ± 5 The square root of the arithmetic of D.25216 is () A. ± 4 B.4 C. ± 2 The cube root of D.2364 is () A.4 B.-4 C.8 D. -8 Resolution: 1 According to the meaning of the square root, knowing (± 5) 2 = 25, so the square root of 25 is ± 5.2 which means the arithmetic square root of 16. Only nonnegative numbers have an arithmetic square root, and their arithmetic levels