计算次方的符号怎么取?
特指有括号无括号时
人气:421 ℃ 时间:2020-04-12 11:47:41
解答
(-2)³表示3个-2相乘(-2)×(-2)×(-2)=-8,负数的奇次方为负
-2³表示3个2相乘的相反数-2×2×2=-2,先乘方再取符号(负号)
(-2)²表示2个-2相乘(-2)×(-2)=4,负数的偶次方为正
-2²表示2个2相乘的相反数-2×2=-2,先乘方再取符号(负号)
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