3x²-4xy+y²a²-b²-2a+4b-36x²+xy-2y²3x²y²-2xy-54a²-4ab+1-c²a²-b²-6a+4b+5
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计算:4xy²-3x²y-{3x²y-[2xy²-4x²y+2(x²y-2xy²)]急
3x²-y²=8x²+xy+y²=4
6x²-xy-15y²=0 求x²-2xy+4y²/2x²-3xy-3y²告诉下
6x²-xy-15y²=0 求2x²-3xy-3y²分之x²-2xy+4y²
4x²y-xy²
已知x² -XY = 2,Y² -XY= 5,求x² - 4x Y+ Y² = 2x² + xY -3Y² = x² 已知x² -XY = 2,Y² -XY= 5,求x² - 4x Y+ Y² = 2x² + xY -3Y² = x² + xY- 2Y² =求x² - 4x Y+ Y² =
若x²+xy-2y²=0,则x²+3xy+y²/x²+y²
x²+xy-2y²=0则x²+3xy+y²/x²+y²
因式分解 3x²+4xy-y²
因式分解3x²+4xy-y²
3x²+4xy-y²因式分解(过程)
因式分解3x²+4xy+y²
求3x²+8xy-3y²-3xy+4y²-3x²
1 3x²+4xy-y²=2 4xy+1-4x²-y²=
单项式2xy,6x²y²,-3xy,-4x²y²的和为--------------
求单项式2xy,6x² y²,-3xy,-4x²y²的和.
(1/3xy)²*(-12x²y²)÷(-4/3x³y)
已知x²+xy=3,xy+y²=—2,求x²-y²的值?x²+4xy+3y²的值?2x²-xy-3y