先化简在求值(x+3/x2-9)+(3/x-3)其中x=-1
先化简在求值(x+3/x2-9)+(3/x-3)其中x=-1
数学人气:719 ℃时间:2020-03-31 07:51:56
优质解答
原式=(x+3)/[(x-3)(x+3)]+3/(x-3)=1/(x-3)+3/(x-3)=4/(x-3)代入=-1
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