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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 6: So sánh `72^45`-`72^44` và `72^44` – `72^43`

Toán Lớp 6: So sánh
72^45-72^44 và 72^44 – 72^43

Comments ( 2 )

  1. Ta có :
     $72^45$ – $72^44$ = $72^44$. ( 72 – 1 ) = $72^44$ . 71
    $72^44$ – $72^43$ = $72^43$. ( 72 – 1 ) = $72^43$ . 71
                     Vì $72^44$ > $72^43$
                                          ⇒ $72^44$ . 71 > $72^43$ . 71
                              Vậy  $72^45$ – $72^44$ > $72^44$ – $72^43$

  2. Ta có:
    72^45-72^44
    =72^43.72^2-72^43.72
    =72^43.(72^2-72)
    =72^43.5112
    72^44-72^43
    =72^43.72-72^43.1
    =72^43.(72-1)
    =72^43.71
    Mà 72^43.71<72^43.5112
    =>72^45-72^44>72^44-72^43

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222-9+11+12:2*14+14 = ? ( )