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

Toán Lớp 6: 51−[2.(7−????)+3(????−5)]=21 Giúp tớ với

Toán Lớp 6: 51−[2.(7−????)+3(????−5)]=21
Giúp tớ với

Comments ( 2 )

  1. Giải đáp:
     $51-[2.(7-x)+3.(x-5)]=21$
    $⇔ 51-(14-2x+3x-15)=21$
    $⇔ 51-x+1=21$
    $⇔ -x=21-52$
    $⇔ -x=-31 $
    $⇔ x= 31$
    $Vậy$ $x=31$
     

  2. 51−[2.(7−x)+3(x−5)]=21
    2(7-x)+3(x-5)=51-21
    => 14-2x+3x-15=30
    => x-1=30
    => x=30+1
    => x=31

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

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