(1)若|2x-8|+|y-6|,求2x-y的值;()已知m,n有理数互为相反数,x,y互为倒数,z=5,求2m+2n+6xy+z的值
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1、若x^2+y^2=5,xy=3,求(x+y)^2 (x-y)^2 2、x^+y^=5,x+y=6,求xy 3、若x+y=6,xy=3,求x^2+y^2 (x-y)^21、若x^2+y^2=5,xy=3,求(x+y)^2 (x-y)^22、x^+y^=5,x+y=6,求xy3、若x+y=6,xy=3,求x^2+y^2 (x-y)^24、a+b=5,a-b=3,求ab
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