若定义x△y=5x+3y,x▽y=3x-5y,那么3又2分之1▽0.5=是3△2分之1▽0.5=

若定义x△y=5x+3y,x▽y=3x-5y,那么3△2分之1▽0.5= 若定义x△y=5x+3y,x▽y=3x-5y,那么3又2分之1▽0.5= （x+y-5)*（x+y-5)+（x-y+3)=0 x*x-y*y 已知:3x-5y=0,求x/y,x-y/y,x-y/x 对任意自然数x.y定义运算如下：若x.y同奇同偶,则x△y=（x+y）/2；若x.y奇偶不同对任意自然数x.y定义运算如下:若x.y同奇同偶,则x△y=(x+y)/2;若x.y奇偶不同,则x△y=(x+y+1)/2,则（1△3)△5= 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) 对于x,y定义两种运算“*”“△”如下：x*y=6x+5y,x△y=3xy,求（2*3）△4 若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值 推倒公式:(x+y)(x*x-3x+y*y)=x*x*x+y*y*y怎么做. 若3x=5y,则x:y=________,(x-y):y=______ （5x+3y)(3y-5x)-(4x-y)(4y+x)= (x-y)/(x+y)=3求( 3x-2y-1)/(x+y-5) 4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11 3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27 x+y/2+x-y/6=5 2(x+y)-3(x-y)=-2 6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5 3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2 若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于