Toán Lớp 8: quy đồng mt các phân thức:
a) x+1/x-2 ; x/x-1
b) x/x^3+1 ; x^2+x ; x+2/x^2-x+1
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Toán Lớp 8: quy đồng mt các phân thức:
a) x+1/x-2 ; x/x-1
b) x/x^3+1 ; x^2+x ; x+2/x^2-x+1
Comments ( 1 )
x/{x-1} = {x(x-2)}/{(x-2)(x-1)}
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b, x/{x^3 + 1} ; x^2 + x ; {x+2}/{x^2 – x +1}. MSC: (x+1)(x^2 – x +1)
x^2 + x = {(x^2 + x)(x+1)(x^2 – x +1)}/{(x+1)(x^2 – x +1)} = {(x^2 + x)(x^3 +1)}/{(x+1)(x^2 – x + 1)}
{x+2}/{x^2 -x +1} = {(x+2)(x+1)}/{(x+1)(x^2 – x +1)}