计算x²+5x+6/x+3+x²-4/x+3-1已知1/a-1/b=3 求分式a-3ab-b/2a+ab-2b的值
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计算x²+5x+6/x+3+x²-4/x+3-1已知1/a-1/b=3 求分式a-3ab-b/2a+ab-2b的值
计算x²+5x+6/x+3+x²-4/x+3-1
已知1/a-1/b=3 求分式a-3ab-b/2a+ab-2b的值
计算x²+5x+6/x+3+x²-4/x+3-1已知1/a-1/b=3 求分式a-3ab-b/2a+ab-2b的值
(x²+5x+6)/(x+3)+(x²-4)/(x+3-1)
=(x+3)(x+2)/(x+3)+(x+2)(x-2)/(x+2)
=(x+2)+(x-2)
=2x
(a-3ab-b)/(2a+ab-2b) 分子分母同除以ab
=(1/a-1/b-3)/(2/a-2/b+1)
=(3-3)/(6+1)
=0