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違います 例えば:(1+i)^2=1+2 i-1=2 iは複数:2 i 一般的には、z=a+biz^2=(a+bi)^2=a^2+2 abi-b^2=(a^2-b^2)+2 abi a、bが0でない限り、z^2は実数ではない。
エラー、たとえば(-1)^2=1
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