14x²-67xy+18y²= (2x-9y)(7x-2y)与14x²-67xy+18y²= (9y-2x)(2y-7x)是不是都对?为什详尽点啊

若x² +xy+y² =14,x² -xy+y²=28求x+y的值 若x²+xy+y²=14,x²-xy+y²=28,求x+y的值 因式分解（有理数范围内） 1.x²y²-x²-y²-6xy+4 2.4x²-6ax-18a² 3.20a&s因式分解（有理数范围内）1.x⁴-12.x²+4x-xy-2y+43.4x²-12x+54.21x²-31x-225.4x²+4xy+y²-4x-2y-36.9x^5-35x ①y²-16；②x³y-xy³；③x²+14x+49；④18a^4x²+24a²x²y+8x²y² x²-7xy+12y²=0｛x²+4xy+4y²=14 0.5x²+xy+0.5y² 因式分解：x²-xy-12y² 4x²y-xy² -9x²-y²+6xy x²-2xy+y²-9 14x²-67xy+18y²= (2x-9y)(7x-2y)与14x²-67xy+18y²= (9y-2x)(2y-7x)是不是都对?为什详尽点啊 6xy²-9x²y-y²因式分解 若x²+xy-2y²=0,则x²+3xy+y²/x²+y² x²+xy-2y²=0则x²+3xy+y²/x²+y² 若x²+xy+y=14,y²+xy+y=28,求x+y的值 若x²+xy+y=14,y²+xy+y=28,求x+y的值 x²+XY+Y=14,Y²+XY+X=28求x+y的值 计算：4xy²-3x²y-{3x²y-[2xy²-4x²y+2(x²y-2xy²)]急