请计算出:[(x-1)分之x]-{[(x-1)(x+2)]分之3}-1

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请计算出:[(x-1)分之x]-{[(x-1)(x+2)]分之3}-1
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请计算出:[(x-1)分之x]-{[(x-1)(x+2)]分之3}-1
请计算出:[(x-1)分之x]-{[(x-1)(x+2)]分之3}-1

请计算出:[(x-1)分之x]-{[(x-1)(x+2)]分之3}-1
x/(x-1) - 3/(x-1)(x+2) -1
=[x(x+2)-3-(x-1)(x+2)]/(x-1)(x+2)
=(x²+2x-3-x²-x+2)/(x-1)(x+2)
=(x-1)/(x-1)(x+2)
=1/(x+2)