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

Toán Lớp 8: 2/5xy*(xy-5x+10y) 3x/x-2-12/x(x-2)-7/x

Tháng Bảy 26, 2022 Toán học 1 Comment 0 views

Toán Lớp 8: 2/5xy*(xy-5x+10y)
3x/x-2-12/x(x-2)-7/x

Comments ( 1 )

  1. dananhthumai
    dananhthumai
    26 Tháng Bảy, 2022 at 9:45 sáng
    Reply
    Giải đáp:
     $\dfrac{2}{5}xy.(xy-5x+10y)$
    $= 0,4x²y²-2x²y+4xy²$
    $\dfrac{3x}{x-2}-\dfrac{12}{x.(x-2)}-\dfrac{7}{x}$
    $= \dfrac{3x.x}{x.(x-2)}-\dfrac{12}{x.(x-2)}-\dfrac{7.(x-2)}{x}$
    $= \dfrac{3x²-7x+2}{x.(x-2)}$
    $= \dfrac{x.(3x-1)-2.(3x-1)}{x.(x-2)}$
    $= \dfrac{3x-1}{x}$
     

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

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