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

Toán Lớp 8: (3x+1)^2+(2x-3)^2-2(3x+1)(2x-3)

Toán Lớp 8: (3x+1)^2+(2x-3)^2-2(3x+1)(2x-3)

Comments ( 2 )

  1. (3x+1)^2+(2x-3)^2-2(3x+1)(2x-3)
    =(3x+1)^2-2(3x+1)(2x-3)+(2x-3)^2
    =(3x+1-2x+3)^2
    =(x+4)^2
    Áp dụng hằng đẳng thức:
    (A-B)^2=A^2-2AB+B^2
    Cho mk xin hay nhất please
    Thank you

  2. (3x+1)^2+(2x-3)^2-2(3x+1)(2x-3)
    =(3x+1)^2-2(3x+1)(2x-3)+(2x-3)^2
    =(3x+1-2x+3)^2
    =(x+4)^2

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

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