把下列各式分解因式[1] x3-xy2 [2] xy3+x4 [3] x2-3x+2 [4] x2-x-2 [5] x2+4x-5 [6] x2+4x+3[7] 6x2-7x-3[8] 2x2-3x-3 [9] 8x2+26x-15 [10] [a-b]2+11[a-b]+28 [11] ax5-10ax4+16ax3 [12] [x2-2x]2-9 [13] 8x2+26xy-15y2 [14][ 6x2-7x]2-25 [15] 3ax-3ay+xy-y2

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