2^x÷16^y=8,则2^x-8^y=
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【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
若x-y=1 化简(x+y)(x^2+y^2)(x^4+y^4)(x^8+y^8)(x^16+y^16)
已知x^2-8x+y^2-y+16又1/4=0,求[(x+y)(x-y)-(x+y)^2-2y(x-3y)]÷4y的值
12y(x-y)^2-8(x-y)^3=?
若x-y不等于0,2x-3y=0,则分式(10x-11y)/(x-y)的值是()?(10x-11y)/(x-y) =[(8x-8y)+(2x-3y)]/(x-y) =8为什么8X-8Y=8?(10x-11y)/(x-y)=[(8x-8y)+(2x-3y)]/(x-y)=8+(2x-3y)]/(x-y)=8+0=8
(x+2y)(x-2y)-(2y-x)(-2x-y)其中x=8,y=-8
[(x+2y)(x-2y)-(x-2y)^2+8y(x+y)]除以4x=
已知X*X+Y*Y+6X-8Y+25=0 求(Y/X)+(X/Y)-2=?
x*x+2x-y*y+6y-8=0,x+y不等于2,求x-y的值
【2(x-y)(x-y)(x-y)-8(x-y)(x-y)(x+y)+6y(x-y)(x-y)]/2(x-y)(x-y)
3分之2(x-y)-4分之x+y=-1 8(x+y)-4(2x-y)=16
已知{2x+y=7,x+2y=8,则x-y=?x+y=?
已知方程组{2x+y=7,x+2y=8,则x-y=(),x+y=().
8(x-y)=3(x+y)-12 6(x+y)=4(2x-y)+16
8(x-y)=3(x+y)-12 6(x+y)=4(2x-y)+16
已知x^2+y^2-16x-8y+25=0,求y/x-x/y的值
若x^2+y^2-6x+8y+25=0 则y/x-x/y的值是