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

Toán Lớp 8: Tính $\frac{-7xy+x^2+10y^2}{(x+y)}$ : $\frac{x-5y}{x^2+2xy}$

Toán Lớp 8: Tính
$\frac{-7xy+x^2+10y^2}{(x+y)}$ : $\frac{x-5y}{x^2+2xy}$

Comments ( 1 )

  1. Giải đáp:
     
    Lời giải và giải thích chi tiết:
     [-7xy+x^2 +10y^2]/[x+y] :[x-5y]/[x^2+2xy]
    =[(x^2 -2xy) +(-5xy+10y^2)]/[x+y].[x^2 +2xy]/[x-5y]
    =[x(x-2y)-5y(x-2y)]/[x+y].[x(x+2y)]/[x-5y]
    =[(x-2y)(x-5y)]/[x+y].[x(x+2y)]/[x-5y]
    =[x(x-2y)(x+2y)]/[x+y]
    =[x(x^2-4y^2 )]/[x+y]
    =[x^3-4xy^2]/[x+y]
    (Bài tham khảo)

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

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