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

Toán Lớp 8: $\frac{3x+11}{x+5}$ – $\frac{x+1}{x+5}$

Toán Lớp 8: $\frac{3x+11}{x+5}$ – $\frac{x+1}{x+5}$

Comments ( 2 )

  1. (3x+11)/(x+5) – (x+1)/(x+5)
    = (3x+11-x-1)/(x+5)
    = (2x+10)/(x+5)
    = [2.(x+5)]/(x+5)
    = 2
    Áp dụng
    A/C – B/C = (A-B)/C

  2. Giải đáp +Lời giải và giải thích chi tiết:
     (3x + 11)/(x + 5) – (x + 1)/(x + 5)
    = [3x + 11 – ( x + 1 )]/(x + 5)
    = (3x + 11 – x – 1)/(x + 5)
    = (2x + 10)/(x + 5)
    =[2(x + 5)]/(x + 5)
    = 2

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