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

Toán Lớp 8: Rút gọn: $\text{$(3x+1)^{2}$+2(3x+1).(1-3x)+(3x-1)}$

Toán Lớp 8: Rút gọn:
$\text{$(3x+1)^{2}$+2(3x+1).(1-3x)+(3x-1)}$

Comments ( 2 )

  1. Giải đáp:
    Sửa (3x-1)->(3x-1)^2
    Lời giải và giải thích chi tiết:
    (3x+1)^2+2(3x+1)(1-3x)+(3x-1)^2
    =(3x+1)^2-2(3x+1)(3x-1)+(3x-1)^2
    =[(3x+1)-(3x-1)]^2
    =(3x+1-3x+1)^2
    =2^2=4

  2. ( 3x + 1 )²+ 2( 3x + 1 ) . ( 1- 3x ) + ( 3x + 1 )²
    = ( 3x + 1 )² – 2(3x + 1 ) (3x -1 ) + ( 3x + 1 )²
    = [ (3x +1) – ( 3x -1 ) ]²
    = (3x + 1 – 3x + 1)²
    =2²
    =4

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

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