-(x2+y2)+[-3xy-(x2-y2)]化简X=-1,y=2X2表示X的2次方 3XY表示XY乘3
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-(x2+y2)+[-3xy-(x2-y2)]化简X=-1,y=2X2表示X的2次方3XY表示XY乘3-(x2+y2)+[-3xy-(x2-y2)]化简X=-1,y=2X2表示X的2次方3XY表示XY
-(x2+y2)+[-3xy-(x2-y2)]化简X=-1,y=2X2表示X的2次方 3XY表示XY乘3
-(x2+y2)+[-3xy-(x2-y2)]化简X=-1,y=2
X2表示X的2次方 3XY表示XY乘3
-(x2+y2)+[-3xy-(x2-y2)]化简X=-1,y=2X2表示X的2次方 3XY表示XY乘3
-(x2+y2)+[-3xy-(x2-y2)]
=-x²-y²-3xy-x²+y²
=-2x²-3xy
=-x(2x+3y)
=-(-1)[(-1×2)+3×2)]
=-2+6
=4
=-(-2+4)+(7-2)
=-2+5
=3
x2-4y2-3xy+y+x
(x-y)(x2+xy+y2)
(x+y)(x2-xy+y2)
计算(x+y/x-y + 4xy/y2-x2)(x2-9y2)/(x2+2xy-3y2)
(3xy-9x2-2y2-6xy)-(6x2+2xy-3xy-y)
已知实数x,y满足x2+xy+y2=3,则x2-xy+y2的最小值
因式分解x2+xy-3y2
X2+3xy+y2因式分解
解方程组①x2-y2=3x+3y②x2-xy+y2=27
如果2/x=3/y,那么x2-2xy+3y2/7x2-y2?
(x2+xy+y2)-4xy(x2+y2)
4x2-3y2+2xy-4x2+5x2
4x2-y2/x2-2xy+y2 +(2x-y)/2x2-2xy
x2+2xy-3y2+3x+y+2 因式分解
因式分解x2+2+y2-3x-2xy+3y
因式分解2y2-xy-3x2-2y+3x
x2+y2+xy-3y+3=0
2x2+xy-3y2+x+4y-1因式分解