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

Toán Lớp 8: a. ( 5x mũ 2 + 9xy – 2y mũ 2) : ( x + 2y) b. ( x mũ 4 – x mũ 3 y + x mũ 2 y mũ 2 – xy mũ 3 ) : ( x mũ 2 + y mũ 2) cần gấp giải nhanh ch

Toán Lớp 8: a. ( 5x mũ 2 + 9xy – 2y mũ 2) : ( x + 2y)
b. ( x mũ 4 – x mũ 3 y + x mũ 2 y mũ 2 – xy mũ 3 ) : ( x mũ 2 + y mũ 2)
cần gấp
giải nhanh chút nha

Comments ( 2 )

  1. $#thanhchuc208$
    \(a)\)
    Ta có :
    \(\left(5x^2+9xy-2y^2\right):\left(x+2y\right)\)
    \(=[\left(5x^2+10xy)-(xy+2y^2\right)]:\left(x+2y\right)\)
    \(=[5x\left(x+2y)-y(x+2y\right)]:\left(x+2y\right)\)
    \(=\left(5x-y\right)(x+2y):\left(x+2y\right)\)
    \(=5x-y\)
    \(b)\)
    Ta có :
    \(\left(x^4-x^3y+x^2y^2-xy^3\right):\left(x^2+y^2\right)\)
    \(=\left[\left(x^4+x^2y^2\right)-\left(x^3y+xy^3\right)\right]:\left(x^2+y^2\right)\)
    \(=\left[x^2\left(x^2+y^2\right)-xy\left(x^2+y^2\right)\right]:\left(x^2+y^2\right)\)
    \(=\left(x^2+y^2\right)\left(x^2-xy\right):\left(x^2+y^2\right)\)
    \(=\left(x^2-xy\right)\)
     

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

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