(x/2)^2+ (x/3)^2+(x/4)^2=(x/5)^2+ (x/6)^2+(x/7)^2

(x/2)^2+ (x/3)^2+(x/4)^2=(x/5)^2+ (x/6)^2+(x/7)^2

0 bình luận về “(x/2)^2+ (x/3)^2+(x/4)^2=(x/5)^2+ (x/6)^2+(x/7)^2”

  1. Đáp án:

    `x=0`

    Giải thích các bước giải:

    `(x/2)^2+ (x/3)^2+(x/4)^2=(x/5)^2+ (x/6)^2+(x/7)^2`

    `->x^2/4+x^2/9+x^2/16=x^2/25+x^2/36+x^2/49`

    `->x^2(1/4+1/9+1/16)=x^2(1/25+1/36+1/49)`

    `->x^2[(1/4+1/9+1/16)-(1/25+1/36+1/49)]=0`

    `+)1/4>1/25`

    `1/9>1/36`

    `1/16>1/49`

    `->[(1/4+1/9+1/16)-(1/25+1/36+1/49)]>0`

    `->x^2=0`

    `->x=0`

    Vậy `x=0`

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