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

Toán Lớp 8: $\frac{5x+1}{x²-5x}$ x $\frac{x+5}{10x+5x}$

Toán Lớp 8: $\frac{5x+1}{x²-5x}$ x $\frac{x+5}{10x+5x}$

Comments ( 2 )

  1. Giải đáp:
    (x-2)/(x+1) . (x^2-2x -3)/(x^2 – 5x +6)$\\$= (x-2)/(x+1) . (x^2 -3x + 1x – 3)/(x^2 – 3x – 2x + 6)$\\$= (x-2)/(x+1) . (x(x-3)+(x-3))/(x(x-3)-2(x-3))$\\$= (x-2)/(x+1) . ((x+1)(x-3))/((x-2)(x-3))$\\$= (x-2)/(x+1) . (x+1)/(x-2) $\\$ = 1
    $\\$
    (5x +1)/(x^2 – 5x).(x+5)/(10x+5x)$\\$=(5x +1)/(x^2 – 5x) . (x+5)/(15x)$\\$= (5x^2 + 26x + 5)/(15x^3 – 75x^2)

  2. Giải đáp:
    = (5x^2+ 26x+ 5)/(15x^3- 75x^2)
    Lời giải và giải thích chi tiết:
     (5x+1)/(x^2- 5x) . (x+5)/(10x+5x)
    = (5x+1)/(x^2- 5x) .(x+5)/(15x)
    = ((5x+1)(x+5) )/ (15x(x^2- 5x))
    = (5x^2+ 25x+ x+5)/(15x^3- 75x^2)
    = (5x^2+ 26x+ 5)/(15x^3- 75x^2) 

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