(3x+___)²=____+12xy+____.已知:(x-3y)²=x²-6xy+(k
1.当k=____时,多项式x²-2(k+2)xy-9y²+6x-7中不含有xy项
当k=____时,x²-kxy与y²+3xy-5的和不含xy项
当k=____时,代数式x²-(3kxy+3y²)+1/3xy-8中不含xy项
已知x/2=y/3(xy≠0),求x²-2xy-3y²/x²-6xy-7y²的值
当K=____时,多项式x²-3kxy+xy+2 不含xy项 求详解,
当k=____时,多项式x²-(3kxy+3y²)+3/1xy-8中不含xy项.8年前父亲的年龄是儿
已知x:y=3:2,求(x²+3xy)/(xy+2xy)
已知x>0,y>0且3x+2y-2xy=0,则xy的最小值是____
已知x²+y²-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)
已知x/y=3,求(x²+2xy-3xy²)/(x²-xy+y²)
已知x/y=2,求x²-xy+3y²/x²+xy+6y²的值
已知2x²+xy=6,3y²+2xy=9,求4x²+8xy+9y²的值为( )