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

Toán Lớp 7: P=x+2y-z\x-2y-z biết x:y:z=2:3:4

Tháng Sáu 2, 2022 Toán học 1 Comment 0 views

Toán Lớp 7: P=x+2y-z\x-2y-z biết x:y:z=2:3:4

Comments ( 1 )

  1. maingocquynhnhu2k1
    maingocquynhnhu2k1
    2 Tháng Sáu, 2022 at 5:41 sáng
    Reply
    Answer
    $\text{Ta có:}$
    x : y : z = 2 : 3 : 4
    => x/2 = y/3 = z/4
    $\text{Đặt:}$ x/2 = y/3 = z/4 = k
    => {(x=2k),(y=3k),(z=4k):}
    $\text{Mà}$ P = {x+2y-z}/{x-2y-z}
    => P = {2k + 2 . 3k – 4k}/{2k – 2 . 3k – 4k}
    => P = {2k + 6k – 4k}/{2k – 6k – 4k}
    => P = {8k – 4k}/{-4k – 4k}
    => P = {4k}/{-8k}
    => P = 4/{-8}
    => P = -1/2
     

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

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