Toán Lớp 8: Bài 1: Thực hiện phép nhân
a) (x-3) (2x-1)
b) (x+3) (x^2-3x+9)
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Toán Lớp 8: Bài 1: Thực hiện phép nhân
a) (x-3) (2x-1)
b) (x+3) (x^2-3x+9)
Comments ( 2 )
a)2{x^2} – 7x + 3\\
b){x^3} + 27
\end{array}\)
a)(x – 3)(2x – 1)\\
= 2{x^2} – x – 6x + 3\\
= 2{x^2} – 7x + 3\\
b)(x + 3)({x^2} – 3x + 9)\\
= {x^3} – 3{x^2} + 9x + 3{x^2} – 9x + 27\\
= {x^3} + 27
\end{array}\)