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已知x+y=6 xy=8求x+2xy+y分之2x-xy+2y的值
人气:167 ℃ 时间:2020-01-31 18:17:38
解答
x+2xy+y分之2x-xy+2y
=[2(x+y)-xy]/[(x+y)+2xy]
=(12-8)/(6+16)
=4/22
=2/11
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