Toán Lớp 8: chuyển thành nhân thức: x+ x^2-x^3-x^4
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Toán Lớp 8: chuyển thành nhân thức: x+ x^2-x^3-x^4
Comments ( 2 )
$=x(1-x^2)+x^2(1-x^2)$
$=(1-x^2)(x+x^2)$
$=(1-x)(1+x)x(1+x)$
$=(1+x)^2(1-x)x$