2x²y+3yx²-4yx²-6xy²+3x-5-5x其中x=2y=2分之1
6x²y+2xy-3x²y²-7x-5yx-4y²x²-6x²
求6x²y+2xy-3x²y²-7x-5yx-4y²x²-6x
3xy+xy+2x²y+yx²+3x²y等于多少
已知x-y=4xy,则2x+3xy-2yx-2xy-y
.先化简,后计算.[2x(x²y-xy²)+xy(xy-x²)]/x²yx=20
6x^2y+2xy-3x^2y^2-7x-5yx-4y^2x^2-6x^2y,其中|x+3|+(y-2)^2=0
实数x、y、z满足x=6-3yx+3y-2xy+2z
合并同类项题目先化简,再求值2XY+3YX^2+6XY-6X^Y其中X=1/2 Y=-4
先化简,再求值: 3-2xy+3yx的平方+6xy-4x的平方y,其中x=-1,y=-2
x²-3xy-3x²y²+2yx²-y²x 合并同类项
先化简,在求值:6x^2y+2xy-3x^2y^2-7x-5yx-4y^2x^2-6x^2y 其中|x+3|+(y-1\
3X²y-3y²X+2Xy²-2yX²当y=-2,X=3时.