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不對! 比如:(1+i)^2 = 1 + 2i - 1 = 2i是一個複數:2i 一般地說:z = a+bi z^2 =(a+bi)^2 = a^2+2abi-b^2 =(a^2-b^2)+ 2abi 只要a、b不為0,那麼z^2就不會是實數.
錯,比如(-1)^2=1
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