若x>2,y>0,则x+y>2,这是真命题还是假命题,它的逆命题,否命题,逆否命题是真命题还是假命题
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若x>2,y>0,则x+y>2,这是真命题还是假命题,它的逆命题,否命题,逆否命题是真命题还是假命题
若x>2,y>0,则x+y>2,这是真命题还是假命题,它的逆命题,否命题,逆否命题是真命题还是假命题
若x>2,y>0,则x+y>2,这是真命题还是假命题,它的逆命题,否命题,逆否命题是真命题还是假命题
真命题.逆否命题为真,逆命题为假,否命题为假.
若3x-5y=0,则x+y/x=(),x-y/y=(),2x-3y/2x+3y=( )
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
(5)若x/2=y/3(y不为0)则x/y=____,x+y/y=___,y/x-y=___.
若f(x+y,y/x)=x^2-y^2,则F(X,Y)=
若x+y=1,x不等于0则x+(2xy+y^2)/x/(x+y)/x=
若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
若2x-5y=0,则y:x
若x,y满足|x-y+1|+(x+y+3)^2=0则x^2-y^2=
若x^2+y^2-6x+8y+25=0 则y/x-x/y的值是
若x,y满足|2x-y-3|+|3x+2y+1|=0,则x= y=
若线段x ,y 满足[2x-3y]*[3x+2y]=0 则x/y=?
若(x*x+y*y)(x*x+y*y)-4x*x*y*y=0,求代数式(x*x+5xy+y*y)/(x*x+2xy+y*y)的值
若实数x y满足(x+y)²+(x+y)-2=0则x+y值为
若x^2+y^2+2x-2y+2=0则x+y=?
若x^2+2x+y^2-6y+10=0,则x-y
若|x+y-3|+(x-y-5)^2=0,则x)^2-y^2=
若|x|=2,|y|=3,且y/2+x《0则x+y
若|x+y+1|+(x-2y)的平方=0,则x+2y=?