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

Toán Lớp 8: `(5x-y-2z)(5x+y-2z)- (5x-2z)^2` Rút gọn nha mn =)

Toán Lớp 8: (5x-y-2z)(5x+y-2z)- (5x-2z)^2
Rút gọn nha mn =)

Comments ( 2 )

  1. Giải đáp:
     
    Lời giải và giải thích chi tiết:
    (5x – y – 2z)(5x + y – 2z) – (5x – 2z)^2
    = (5x – 2z)^2 – y^2 – (5x – 2z)^2
    = -y^2

  2. (5x-y-2x)(5x+y-2z)-(5x-2z)^2
    = [(5x-2z)-y][(5x-2z)+y]-(5x-2z)^2
    =(5x-2z)^2-y^2-(5x-2z)^2
    =-y^2

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