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

Toán Lớp 8: (x-5)^2+(x+5).(x-5)-(5-x).(2x+1)

Toán Lớp 8: (x-5)^2+(x+5).(x-5)-(5-x).(2x+1)

Comments ( 2 )

  1. Giải đáp:
    =4x^2-19x-5
    Lời giải và giải thích chi tiết:
    (x-5)^2+(x+5)(x-5)-(5-x)(2x+1)
    =x^2-10x+25+x^2-25+(2x+1)(x-5)
    =2x^2-10x+(2x+1)(x-5)
    =2x(x-5)+(2x+1)(x-5)
    =(x-5)(2x+2x+1)
    =(x-5)(4x+1)

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

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