Mathematics
Senior High
２行めの式はなぜ３行めの式に変換できるのですか？
iが一つだけある場合はマイナスに変えることはできませんよね？
(3) (与式) =13+ 3・12・i + 3・1・22+i3
=1+3i+3i2+ i²i
=(1-3)+(3-1)i
=-2+2i
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