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

Toán Lớp 8: 2(3x+1)(3x+5) Giups mk vs , gải chi tiết nhek

Toán Lớp 8: 2(3x+1)(3x+5)
Giups mk vs , gải chi tiết nhek

Comments ( 2 )

  1. 2(3x+1)(3x+5)
    = (6x+2)(3x+5)
    = 18x^2 + 30x + 6x + 10
    = 18x^2 + (30x + 6x) +10
    = 18x^2 + 36x+10

  2. $\text{- Ta có:}$
      $2(3x+1)(3x+5)$
    $=(2.3x+2.1)(3x+5)$
    $=(6x+2)(3x+5)$
    $=6x.3x+6x.5+2.3x+2.5$
    $=18x^2+30x+6x+10$
    $=18x^2+36x+10$

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