khai triển đa thức a/ (3x^2-2x+1)+ 2.(x-1) b/ 3x.(5x^2-2x-1) c/ (x^2+2xy-3).(-xy) d/ X.(2x^2-3)-x^2 .(5x-1)+x^2
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Đáp án:
Giải thích các bước giải:
$a/ (3x^2-2x+1)+2(x-1)$
$=3x^2-2x+1+2x-2$
$=3x^2-1$
$b/ 3x(5x^2-2x-1)$
$=15x^3-6x^2-3x$
$c/ (x^2+2xy-3)(-xy)$
$=-x^3y-2x^2y^2+3xy$
$d/ x(2x^2-3)-x^2(5x-1)+x^2$
$=2x^3-3x-5x^3+x^2+x^2$
$=-3x^3-3x+2x^2$