Toán Lớp 8: Rút gọn biểu thức:
(x-2)(x^2+2x+4)-x(x-3)(x+3)
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Toán Lớp 8: Rút gọn biểu thức:
(x-2)(x^2+2x+4)-x(x-3)(x+3)
Comments ( 2 )
$=x^3-2^3-x(x^2-3^2)$
$=x^3-8-x^3+9x$
$=9x-8$
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