Toán Lớp 8: a) (1-x )(1+x+x^2)
b) (2x+3y)(1+x+x^2)
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Toán Lớp 8: a) (1-x )(1+x+x^2)
b) (2x+3y)(1+x+x^2)
Comments ( 2 )
a) (1-x)(1+x+x^2)
=1-x^3
b) (2x+3y)(1+x+x^2)
=2x+2x^2+2x^3+3y+3xy+3x^2y