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先化简,再求值2x-6y/x^2-9y^2,已知2x+6y+1=0
人气:437 ℃ 时间:2020-03-13 00:51:00
解答
2x+6y+1=0
x+3y=-1/2
2x-6y/x^2-9y^2
=2(x-3y)/(x+3y)(x-3y)
=2/(x+3y)
=2/(-1/2)
=--4
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