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

Toán Lớp 6: Tìm x,y biết `7/x` = `y/21` = `-42/54`

Toán Lớp 6: Tìm x,y biết 7/x = y/21 = -42/54

Comments ( 2 )

  1. $Xét$:
    $\frac{y}{21}=\frac{-42}{54}$
    $=>54y=(-42).21$
    $=>54y=-882$
    $=>y=-882:54$
    $=>y=\frac{-49}{3}$
    $Xét:$
    $\frac{7}{x}=\frac{\frac{-49}{3}}{21}$
    $=>\frac{-49}{3}x=7.21$
    $=>\frac{-49}{3}x=147$
    $=>x=147:\frac{-49}{3}$
    $=>x=-9$
    $Vậy x=-9, y=\frac{-49}{3}$
    Chúc bạnhọc tốt
    Xin hay nhất cho nhóm

  2. ảnh nha .
    Xin câu trả lời hay nhất ạ .
     

    toan-lop-6-tim-y-biet-7-y-21-42-54

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