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

Toán Lớp 8: $\frac{1}{2x+2}$ ${-}$ $\frac{x-1}{3x^2+6x+3}$

Toán Lớp 8: $\frac{1}{2x+2}$ ${-}$ $\frac{x-1}{3x^2+6x+3}$

Comments ( 1 )

  1. Giải đáp:
    1/[2x + 2] – [x – 1]/[3x^2 + 6x + 3]
    = 1/[2.(x + 1)] – [x – 1]/[3.(x^2 + 2x + 1)]
    = 1/[2.(x + 1)] – [x – 1]/[3.(x+1)^2]
    = [3.(x + 1)]/[6.(x + 1)^2] – [2.(x – 1)]/[6.(x + 1)^2]
    = [3x + 3]/[6.(x + 1)^2] – [2x – 2]/[6.(x + 1)^2]
    = [3x + 3 – 2x + 2]/[6.(x + 1)^2]
    = [x + 5]/[6.(x + 1)^2]
    #dariana

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