若x、y满足2x+y=6,x-3y=1,求7y(x-3y)²-2(3y-x)³的值
若x、y满足2x+y=6,x-3y=1,求7y(x-3y)²-2(3y-x)³的值
已知x,y的值满足方程组x+2y=3,x-y=-2,求x/(x-y)²+x²-y²/(x+
已知:x,y满足|2x-y|+|y-1/2|=0,求7x-3y的值.
已知方程组2x+y=6 x-3y=1,求7y(x-3y)²-2(3y-x)³的值
不解方程组{2x+Y=6,x-3y=1,求7y(x-3y)²-2(3y-x)³的值.
已知方程组{2x+y=6,x-3y=1,求7y(x-3y)²-2(3y-x)³的值.
(1)已知x+y=6,x²-y²=5,求x-y的值(2)若x+y=3,x²+y²
若变量x,y满足约束条件{x>=-1;y>=x;3x+2y
已知实数x.y满足根号(x+y-8)+根号(8-x-y)=根号(3x-y-4)+根号(x-2y+7),求x,y
若实数x,y满足2x*X+3y*y=1,S=3x*x-2y*y,则S的取值范围为
若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
不解方程组{2x+y=6,x-3y=1},求7y(x-3y)²-2(3y-x)的3次方的值