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13. golova reblogged this from handa and added:

    Найдите ошибочку…

14. eltrupr reblogged this from jz0f and added:

    This is the only type of math I was actually good at.

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17. samazama reblogged this from handa and added:

    a=b ↓ (a+b)(a-b)=b(a-b) (a+b)×0＝b×0 (∵a-b=0) but, a+b≠b

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23. kabaken reblogged this from handa and added:

    4行目から5行目への過程で両辺をa-b=0で割ったらアカンと言うこと？

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