如果(3x+3y+1)(3x+3y-1)=63,那么x+y的值是?
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如果(3x+3y+1)(3x+3y-1)=63,那么x+y的值是?如果(3x+3y+1)(3x+3y-1)=63,那么x+y的值是?如果(3x+3y+1)(3x+3y-1)=63,那么x+y的值是?(
如果(3x+3y+1)(3x+3y-1)=63,那么x+y的值是?
如果(3x+3y+1)(3x+3y-1)=63,那么x+y的值是?
如果(3x+3y+1)(3x+3y-1)=63,那么x+y的值是?
(3x+3y+1)(3x+3y-1)=(3X+3Y)²-1=63,则9(x+y)²=64,x+y=±8/3
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