已知-x+2y=6,则3(x-2y)2-5(x-2y)+6的值是______.
已知-x+2y=6,则3(x-2y)2-5(x-2y)+6的值是______.
已知2x+3y=5,则6x-4y-2(x-5y)=______.
已知(x-3)2+|2x-3y+6|=0,则x=______,y=______.
已知集合M={(x,y)|y=x+3},N={(x,y)|y=-2x+6},则M∩N=______.
已知y=x-1,则(x-y)2+(y-x)+1的值为______.
已知2x+3y=3,则代数式(2x+3y)2-4x-6y-2的值为______.
(1)已知x+y=6,x²-y²=5,求x-y的值(2)若x+y=3,x²+y²
已知x+2y=2,则3x+6y-5=______.
若2x-5y=0,且x不等于0,则(6x-5y)/(6x+5y)的值是______.
已知xy=2,x-y=3,求(x+y)(x-y)-y^2-(6x^2y-2xy^2)/2y的值.
已知xy=-2,x-y=3,求(x+y)(x-y)-y平方+(x-y)平方-(6x2y-2xy平方)/2y的值
已知2x+y=5x+2y=6,那么x-y的值是( )