3|2x-3y|+│2-3x|=0∵3|2x-3y|≥0,│2-3x|≥0∴2x-3y=0,2-3x=0∴x=2/3,y=4/9∴x²-2xy=4/9-2×2/3×4/9=-4/27 2|4+2x|+|5-2y|=0∵|4+2x|≥0,|5-2y|≥0∴4+2x=0,5-2y=0∴x=-2,y=5/2∴x²-y²=4-25/4=-9/4...已知|3-2x|=5,|4+3y|=2,x-y²的值是
若|x|=3,|y|=4,且xy>0,则y²-x²=
若|x|=1,|y|=4,且xy<0,则x²-2y=(1)|3-2x|=5,|4+3y|=2
3-2x=±5,4+3y=±2
∴x=4或-1,y=-2/3或-2
∴①x-y²=4-4/9=32/9
②x-y²=4-4=0
③x-y²=-1-4/9=-13/9
④x-y²=-1-4=-5
(2)若|x|=3,|y|=4,且xy>0,则y²-x²=3²-4²=-7
(3)若|x|=1,|y|=4,且xy<0,则x²-2y=1²-2×(±4)=9或-7