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

Toán Lớp 8: Bài 1: Rút gọn A = (3x – 1) ² + 2(3x -1) (2x+1) + (2x +1) ² B = (2x +3) (4x ² – 6x + 9) + 8(1 – x) (1 +x +x ²)

Toán Lớp 8: Bài 1: Rút gọn
A = (3x – 1) ² + 2(3x -1) (2x+1) + (2x +1) ²
B = (2x +3) (4x ² – 6x + 9) + 8(1 – x) (1 +x +x ²)

Comments ( 2 )

  1. Giải đáp:
    A = 25x^5
    B = 35
    Lời giải và giải thích chi tiết:
    A = (3x – 1) ² + 2(3x -1) (2x+1) + (2x +1) ²
    A = (3x-1+2x+1)^2
    A = (5x)^2
    A = 25x^2
     
    B = (2x +3) (4x ² – 6x + 9) + 8(1 – x) (1 +x +x ²)
    B = (2x)^3 + 3^3 + 8 (1-x^3)
    B = 8x^3 + 27 + 8 – 8x^3
    B = 35

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

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