已知x-5y=0,化简(2x+y)(x-y)/x²+2xy+y²并求值.
已知x-5y=0,化简(2x+y)(x-y)/x²+2xy+y²并求值.
先化简,再求值先化简,再求值:已知x+y=5,2x-y=1,化简xy(x+y的平方)-y的平方(xy-x)+2x(x-y
已知x²+y²-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)
已知2x+y=0,求x-2y/x²+xy*(x²-y²)/x²-4xy+4y
已知(x+3)+丨X-y+10丨=0 ,求5x²y-[2x²y-(3xy-xy²)-3x&
已知x²+y²-2x+4y+5=0,求X^4-y^4/2x^2+xy-y²·2x-y/xy
先化简,后求值[(x-y)²-(x+y)]/(2xy) 先化简,后求值[(x-y)²-(x+y)]/
(x+2y-3xy)-(-2x-y+xy),其中x+y=,xy=-,求值.
已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y²
已知(x+2)^2+|x+y+5|=0,求3x^2y-[2x^2y-(2xy-x^2y)-4x^2]-xy
化简求值:x-y/x²-2xy+y²-xy+y²/x²-y²,其中(x
化简求值:已知【3x分之2-x+y分之2(3x分之x+y-x-y)】÷5x+3y=0