Mathematics
Senior High
至急です‼️なぜこうなるのですか?
2an➕1になる過程を教えてください
an+1=Sn+1-S であるから
an+1={2an+1−(n+1)} -(2a-n)
an+1=2an+1
すなわち
これを変形して an+1+1=2(an+1)
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