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当X为何值时,代数式(2X+9)/(X+3)-1/(X-3)-2/X的值等于2
人气:402 ℃ 时间:2019-10-19 14:22:52
解答
(2x+9)/(x+3)-1/(x-3)-2/x=2 (2x+6+3)/(x+3)-1/(x-3)-2/x=2 2+3/(x+3)-1/(x-3)-2/x=2 3/(x+3)-1/(x-3)-2/x=0 3/(x+3)=1/(x-3)+2/x 3/(x+3)=[x+2(x-3)]/[x(x-3)] 3/(x+3)=(3x-6)/[x(x-3)] 1/(x+3)=(x-2)/[x(x-3)] (x+...
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