(x – 1) + (x – 2) + (x – 3) + (x – 4) = 30 x/2 + 3/4 = 6/7 14/09/2021 Bởi Madelyn (x – 1) + (x – 2) + (x – 3) + (x – 4) = 30 x/2 + 3/4 = 6/7
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` Bình luận
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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`