Mathematic Problems
1x-644+2x+1x2·x24-4x+1x2-4x22x+11-2xxZ
1x-644+2x+1x2·x24-4x+1x2-4x22x+11-2x
=1-64x6x64x2+2x+1x2·x24x2-4x+1x2
=1-64x6x44x+2x+1·x44x4-4x+1
=1-8x324x2+2x+14x2-4+1
=1-8x31+8x34x2+2x+11-2x2
=1-2x1+2x+4x21+2x1-2x+4x24x2+2x+11-2x2
=1+2x1-2x+4x21-2x-4x22x+11-2x
=2x+14x2-2x+1-4x21-2x
=2x+11-2x1-2x
=2x+1
1x-644+2x+1x2·x24-4x+1x2-4x22x+11-2x=2x+1