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

Toán Lớp 7: `x/3=y/5=z/7`và `2x-y+3z=110` nhanh

Home/ Toán Lớp 7: `x/3=y/5=z/7`và `2x-y+3z=110` nhanh

Toán Lớp 7: `x/3=y/5=z/7`và `2x-y+3z=110` nhanh

Tháng Chín 14, 2022 Toán học 2 Comments 0 views

Toán Lớp 7: x/3=y/5=z/7và 2x-y+3z=110
nhanh

Comments ( 2 )

  1. hienchaudiem
    hienchaudiem
    14 Tháng Chín, 2022 at 12:16 sáng
    Reply
    $\text{$\dfrac{x}{3}$=$\dfrac{y}{5}$=$\dfrac{z}{7}$}$
    $\text{$\Rightarrow$ $\dfrac{2x}{6}$=$\dfrac{y}{5}$=$\dfrac{3z}{21}$}$
    $\text{$\Rightarrow$ $\dfrac{2x-y+3z}{6-5+21}$}$
    $\text{$\Rightarrow$ $\dfrac{110}{22}$=5}$
    $\text{+$\dfrac{x}{3}$=5 $\Rightarrow$ x=15}$
    $\text{+$\dfrac{y}{5}$=5 $\Rightarrow$ y=25}$
    $\text{+$\dfrac{z}{7}$=5 $\Rightarrow$ x=35}$

  2. thienthanh
    thienthanh
    14 Tháng Chín, 2022 at 12:15 sáng
    Reply
    #huy
    x/3=y/5=z/7 => 2x/6=y/5=3z/21
    2x/6=y/5=3z/21=(2x-y+3z)/(6-5+21)=110/22=5
    +)x/3=5<=>x=15
    +)y/5=5<=>y=25
    +)z/7=5<=>z=35
     

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

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