(x – 1) + (x – 2) + (x – 3) + (x – 4) = 30 x/2 + 3/4 = 6/7

(x – 1) + (x – 2) + (x – 3) + (x – 4) = 30
x/2 + 3/4 = 6/7

0 bình luận về “(x – 1) + (x – 2) + (x – 3) + (x – 4) = 30 x/2 + 3/4 = 6/7”

  1. a)

    `(x-1)+(x-2)+(x-3)+(x-4)=30`

    `⇔x-1+x-2+x-3+x-4=30`

    `⇔4x-10=30`

    `⇔4x=40`

    `⇔x=10`

    b)

    `x/2+3/4=6/7`

    `⇔x/2=3/28`

    `⇔28x=2.3`

    `⇔x=6/28=3/14`

     

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