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

Toán Lớp 8: a) (5x + 1) ² – (5x + 3 ) (5x – 3) b) (x + 3) ² + (x – 2)(x + 2) – 2 (x – 1) ² làm giúp mik nhé

Toán Lớp 8: a) (5x + 1) ² – (5x + 3 ) (5x – 3) b) (x + 3) ² + (x – 2)(x + 2) – 2 (x – 1) ² làm giúp mik nhé

Comments ( 1 )

  1. Giải đáp + Lời giải và giải thích chi tiết:
    a, (5x+1)^2-(5x+3)(5x-3)
    = 25x^2 + 10x + 1 – 25x^2 + 9
    = (25x^2-25x^2) + 10x + (9+1)
    = 10x + 10
    b, (x+3)^2 + (x-2)(x+2)-2(x-1)^2 
    = x^2 + 6x + 9 – x^2 – 4 – 2x^2 + 4x – 2
    = (2x^2-x^2-x^2) + (6x+4x) + (9-2-4)
    = 10x + 3

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

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