A=3X²-xy+y²,B=2x²-3xy-2y²,那么2A-3B等于多少
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A=3X²-xy+y²,B=2x²-3xy-2y²,那么2A-3B等于多少
因该是6y²吧
因该是6y²吧
![A=3X²-xy+y²,B=2x²-3xy-2y²,那么2A-3B等于多少](/uploads/image/z/18603966-30-6.jpg?t=A%3D3X%26sup2%3B-xy%2By%26sup2%3B%2CB%3D2x%26sup2%3B-3xy-2y%26sup2%3B%2C%E9%82%A3%E4%B9%882A-3B%E7%AD%89%E4%BA%8E%E5%A4%9A%E5%B0%91)
2A-3B=6x^2-2xy+2y^2-(6x^2-9xy-2y^2)=8y^2+7xy
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 .
已知a=2x²-3xy+y²,b=x²+2xy-3y²,化简:(1)a+b (2
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已知x/y=3,求x²+2xy-3y²/x²-xy+y²的值
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计算:(1).(-2xy²)*(3x²y)²
3y/2x+2y+2xy/x²+xy 2x/x²-64y²-1/x-8y (1/a+1/b
|x+2y+3|+(2x+y)²=0求x²-xy+y²
例如:a²+b²-c²-4d²-2ab+4cd x²+2xy+y&su