Toán Lớp 8: Rút gọn phân thức: (x ^ 3 – x ^ 2 – x + 1)/(x ^ 2 – 2x + 1)
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Toán Lớp 8: Rút gọn phân thức: (x ^ 3 – x ^ 2 – x + 1)/(x ^ 2 – 2x + 1)
Comments ( 2 )
=(x³+x²-2x²-2x+x+1)/(x²-2x+1)
=(x²(x+1)-2x(x+1)+(x+1))/(x²-2x+1)
=((x²-2x+1)(x+1))/(x²-2x+1)
=x+1