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

Toán Lớp 8: a. 27x^3 – 27x^2 + 3x +1 b. x^3 – 3x^2 +3x – 1 c. 1/27 + x^3 d. 0,001 – 1000x^3

Toán Lớp 8: a. 27x^3 – 27x^2 + 3x +1
b. x^3 – 3x^2 +3x – 1
c. 1/27 + x^3
d. 0,001 – 1000x^3

Comments ( 2 )

  1. d.0.001=0.1^3;1000x^3=(10x)^3
    Xin hay nhất
     

    toan-lop-8-a-27-3-27-2-3-1-b-3-3-2-3-1-c-1-27-3-d-0-001-1000-3

  2. Giải đáp:
     
    Lời giải và giải thích chi tiết:
     a) 27x^3-27x^2+3x+1
    =27^3-9x^2-18x^2+6x-3x+1
    =9x^2(3x-1)-6x(3x-1)-(3x-1)
    =(3x-1)(9x^2-6x-1)
     b) x^3-3x^2+3x-1
    =x^3-x^2-2x^2+2x+x-1
    =x^2(x-1)-2x(x-1)+(x-1)
    =(x-1)(x^2-2x+1)
    =(x-1)(x-1)^2
    =(x-1)^3
     c) 1/27+x^3
    =x^3+(1/3)^3
    =(x+1/3)(x^2-1/3x+1/9)
     d) 0,001-1000x^3
    =(0,1)^3-(10x)^3
    =(0,1-10x)(0,01+x+100x^2)
    text{xin 5 sao và hay nhất nha}

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

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