Toán Lớp 9: làm tính chia
2x^3-5x^2-x+1 : 2x+1
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Toán Lớp 9: làm tính chia
2x^3-5x^2-x+1 : 2x+1
Comments ( 1 )
2x^3-5x^2-x+1
=2x^3+x^2-6x^2-3x+2x+1
=x^2(2x+1)-3x(2x+1)+(2x+1)
=(2x+1)(x^2-3x+1)
->2x^3-5x^2-x+1:2x+1=(2x+1)(x^2-3x+1):2x+1=x^2-3x+1
Vậy : 2x^3-5x^2-x+1:2x+1=x^2-3x+1