Toán Lớp 8: Tính: x/2x+4 + 3x+2/x^2-4
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Toán Lớp 8: Tính: x/2x+4 + 3x+2/x^2-4
Comments ( 2 )
= (3x^2 – 4 – 2x(x + 2) – x(x – 2)/(x-2)(x+2)
= (3x^2 – 4 – 2x^2 – 4x – x^2 + 2x)/[(x – 2)(x + 2)]
= (-2x – 4)/(x – 2)(X + 2)
= -2(x + 2)/ [(x – 2)(x + 2)]
= 2/2-x