-a⁴+16=,4xy-4x²y-y³=
-a⁴+16=,4xy-4x²y-y³=
已知A=4x²-4xy+y²,B=x²+xy-5y²,化简A-2B
已知3x-y+2z=x+2y+3z=0,求(3x^-xy+2y^)/(2x^+4xy+y^)值?
已知:x-y=1,xy=-2,求(3x-4y+2xy)-(2x-5y+5xy)的值
已知:x-y=1,xy=-2,求(3x-4y 2xy)-(2x-5y 5xy)的值
已知x-y=4,xy=-2,则代数式(3x-4y+5xy)-(2x-3y-2xy)的值是多少
A=2x²-3xy+y²-x+2y,B=4x²-6xy+2y²+3x-y,若x=
设A=2x²-3xy+y²-x+2y,B=4x²-6xy+2y²-3x-y,若x
2x+y=0,求4x²+2xy(x+y)+y³
已知A=x³-2y³+3x²y+xy²-3xy+4,B=y³-x
已知x²-xy=4,y²-xy=9求下面代数式的值(1)x²-2xy+y²;(2
若A=2x²-4xy-2y²-2x+2y,B=4x²-6xy+2y²-3x-y.