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

Toán Lớp 8: Thực hiện phép tính a) $\frac{2x+1}{x+2}$ +$\frac{x+5}{x+2}$ b) $\frac{4x+3}{2x^2y}$ $\frac{3}{2x^2y}$

Toán Lớp 8: Thực hiện phép tính
a) $\frac{2x+1}{x+2}$ +$\frac{x+5}{x+2}$
b) $\frac{4x+3}{2x^2y}$ $\frac{3}{2x^2y}$

Comments ( 2 )

  1. a)(2x+1)/(x+2)+(x+5)/(x+2)
    =[(2x+1)+(x+5)]/(x+2)
    =(2x+1+x+5)/(x+2)
    =(3x+6)/(x+2)
    =[3(x+2)]/(x+2)
    =3
    b)(4x+3)/(2x^2y)-3/(2x^2y)
    =[(4x+3)-3]/(2x^2y)
    =(4x+3-3)(2x^2y)
    =4x/2x^2y
    =2/xy
     

  2. Giải đáp:
     #Clickbim 
    a) $\dfrac{2x+1}{x+2}$ + $\dfrac{x+5}{x+2}$ (ĐK : x \ne -2) 
    = $\dfrac{2x+1+x+5}{x+2}$
    = $\dfrac{(2x+x)+(1+5)}{x+2}$
    = $\dfrac{3x+6}{x+2}$
    = $\dfrac{3(x+2)}{x+2}$
    = 3
    b) $\dfrac{4x+3}{2x²y}$  – $\dfrac{3}{2x²y}$
    = $\dfrac{4x+3-3}{2x²y}$
    = $\dfrac{4x}{2x²y}$
    = $\dfrac{2}{xy}$
    Lời giải và giải thích chi tiết:
     

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

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