x-1分之x²+5x - x²-x分之2x²+4x

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x-1分之x²+5x-x²-x分之2x²+4xx-1分之x²+5x-x²-x分之2x²+4xx-1分之x²+5x-x²-

x-1分之x²+5x - x²-x分之2x²+4x
x-1分之x²+5x - x²-x分之2x²+4x

x-1分之x²+5x - x²-x分之2x²+4x
原式=(x²+5x)/(x-1)-x(2x+4)/x(x-1)
=(x²+5x)/(x-1)-(2x+4)/(x-1)
=(x²+5x-2x-4)/(x-1)
=(x+4)(x-1)/(x-1)
=x+4