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化简;[x+3/x+2]+[2-x/x平方-4]的值
人气:314 ℃ 时间:2020-01-27 10:41:18
解答
原式=(x+3)/(x+2)-(x-2)/(x+2)(x-2)
=(x+3)/(x+2)-1/(x+2)
=(x+3-1)/(x+2)
=(x+2)/(x+2)
=1
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