Toán Lớp 8: a, 7 $x^{5}$ y-14 $x^{3}$ y+21 $x^{2}$ y
b, $-x^{2}$ +2xy $-y^{2}$+4
ai nhanh mik vote 5 sao và cho clht!
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Toán Lớp 8: a, 7 $x^{5}$ y-14 $x^{3}$ y+21 $x^{2}$ y
b, $-x^{2}$ +2xy $-y^{2}$+4
ai nhanh mik vote 5 sao và cho clht!
Comments ( 2 )
$=7x^2y(x^3-2x+3)$
b,
$=4-(x^2-2xy+y^2)$
$=4-(x-y)^2$
$=(2-x+y)(2+x-y)$