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

Toán Lớp 7: Tìm x a, $\frac{x}{-3}$ = $\frac{27}{-x}$ b, $\frac{3x+1}{2}$ = $\frac{2x+1}{3}$

Toán Lớp 7: Tìm x
a, $\frac{x}{-3}$ = $\frac{27}{-x}$
b, $\frac{3x+1}{2}$ = $\frac{2x+1}{3}$

Comments ( 2 )

  1. $\frac{x}{-3}$ = $\frac{27}{-x}$
    ⟹ x^2 = -81
    ⟹ x ^2= $\frac{-81}{-2}$
    ⟹ x^2 = 9
    ⟹ x=9 hoặc x=-9
    $\frac{3x+1 }{2}$ = $\frac{2x+1}{3}$
    ⟹ (3x+1).3 = (2x+1).2
    ⟹ 9x+3 = 4x+2
    ⟹ 9x-4x = -3+2
    ⟹ 5x = -1
    ⟹ $\frac{-1}{5}$

  2. ~ Bạn tham khảo ~
    a)x/(-3) = 27/(-x)
    x/(-3) = (-27)/x
    => x.x = (-27).(-3)
    => x^2 = 81
    => x^2 = (+-9)^2
    => x = (-9) hoặc 9
    Vậy x = 9 ; -9
    b)(3x+1)/2 = (2x+1)/3
    => 3(3x+1) = 2(2x+1)
    => 9x + 3 = 4x + 2
    => 9x – 4x = 2 – 3
    => 5x = -1
    => x =(-1):5
    => x = -1/5
    Vậy x = -1/5
    $#Vịt vàng$

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