Mathematics
Senior High
なぜこのような計算になるのでしょうか？教えてください！
(2) 1+10 +102+・・・・・ +10 +10(1+4)
= | | (10* -1) + 10* = 1 - (10*+1 −1)
(3) 1.2±2.51
b(2b+1)
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