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

Toán Lớp 8: (1-2x)(5-3x)+(4-x)^2 Giúp mình nha

Toán Lớp 8: (1-2x)(5-3x)+(4-x)^2
Giúp mình nha

Comments ( 2 )

  1. Giải đáp:
     $(1-2x).(5-3x)+(4-x)²$
    $= 5-3x-10x+6x²+16-8x+x²$
    $= (6x²+x²)-(3x+10x+8x)+(5+16)$
    $= 7x²-21x+21$
     

  2. Answer
    $(1-2x)(5-3x)+(4-x)^2 $
    $={5−13x+6x^ 2 +(4−x)^ 2}$
    $={5−13x+6x^ 2 +16−8x+x^ 2}$
    $={21−13x+6x^ 2 −8x+x^ 2}$
    $={21−21x+6x^ 2 +x^ 2}$
    $={21−21x+7x^ 2}$
     

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