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

Toán Lớp 9: `x1^4` `-` `x1^3` `=` `x2^4` `-“ x2^3`

Toán Lớp 9: x1^4 – x1^3 = x2^4 – x2^3

Comments ( 1 )

  1. Giải đáp:
     
    Lời giải và giải thích chi tiết:
     x_1^4-x_1^3=x_2^4-x_2^3
    ⇔ x_1^4-x_2^4=x_1^3-x_2^3
    ⇔ (x_1^2+x_2^2)(x_1^2-x_2^2)=(x_1-x_2)(x_1^2+x_1x_2+x_2^2)
    ⇔ (x_1^2+x_2^2)(x_1+x_2)(x_1-x_2)=(x_1-x_2)(x_1^2+x_1x_2+x_2^2)
    ⇔ (x_1-x_2)[2(x_1^2+x_2^2)-x_1-x_1x_2-x_2^2]=0
    ⇔ (x_1-x_2)[x_1^2+x_2^2-x_1x_2]=0

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

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