1x2\1+2x3\1+3x4\1.+98x99\1+99=100\1=?
问题描述:
1x2\1+2x3\1+3x4\1.+98x99\1+99=100\1=?
答
(4x*x-7X+6Y-1)-(-2x*x+3y*y+2Y+2X)+(-6X*X+9X-Y)
=4x*x-7X+6Y-1+2x*x-3y*y-2Y-2X-6X*X+9X-Y
合并同类项
=3Y-1-3y*y
所以值于X无关