Toán Lớp 8: Làm tính chia:
( 27x ³ + y ³) : ( 9x ² – 3xy + y ²)
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Toán Lớp 8: Làm tính chia:
( 27x ³ + y ³) : ( 9x ² – 3xy + y ²)
Comments ( 2 )
{a^3} + {b^3} = \left( {a + b} \right)\left( {{a^2} – ab + {b^2}} \right)\\
27{x^3} + {y^3} = {\left( {3x} \right)^3} + {y^3} = \left( {3x + y} \right)\left( {9{x^2} – 3y + {y^2}} \right)\\
\Rightarrow \left( {27{x^3} + {y^3}} \right):\left( {9{x^2} – 3y + {y^2}} \right)\\
= \left( {3x + y} \right)\left( {9{x^2} – 3y + {y^2}} \right):\left( {9{x^2} – 3y + {y^2}} \right)\\
= 3x + y
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