3xy-2x-12y+8和a²-b²+6b-9.
设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|
设A=2x²-3xy+y²-x+2y ,B=4x²-6xy+2y²+3x-y .
3y/2x+2y+2xy/x²+xy 2x/x²-64y²-1/x-8y (1/a+1/b
已知a=2x²-3xy+y²,b=x²+2xy-3y²,化简:(1)a+b (2
已知A=4x²-5xy+y²,B=x²+3xy-5y² 求:A-2B的值
例如:a²+b²-c²-4d²-2ab+4cd x²+2xy+y&su
12x²+4x-1 x²-(a+b)xy+aby² xy-1+x-y x²-(2
多项式除以单项式(6xy+5x)÷x(8a²b-4ab²)÷4ab(15x²y-10xy&
2道数学集合设A={x-y,x+y,xy},B={x²+y²,x²-y²,0},
分解因式:9x²-16(a+b)² 1/2x⁴y²-1/8x²y
3a-3b/10ab*25a²b³/a²-b² x²-4y²