Toán Lớp 8: a,3x (5 $x^{2}$ – 2x – 1 )
b, ( $x^{2}$ + 2xy – 3 ) . ( -xy )
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Toán Lớp 8: a,3x (5 $x^{2}$ – 2x – 1 )
b, ( $x^{2}$ + 2xy – 3 ) . ( -xy )
Comments ( 2 )
a)
3x.(5x^(2)-2x-1)
=3x.5x^(2)-3x.2x-3x.1
=15x^(3)-6x^(2)-3x
b)
(x^(2)+2xy-3).(-xy)
=x^(2).(-xy)-2xy.xy+3.xy
=-x^(3)y-2x^(2)y^(2)+3xy
a,3x (5x^2 – 2x – 1 )
=15x^3-6x^2-3x
b)(x^2+2xy-3)(-xy)
=-x^{3}y-2x^{2}y^2+3xy
mik nhân nó ra như thế này nhưng theo mik thì để như cũ là được rồi