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设 a = b
方程两边乘 a a2 = ab
方程两边减 b2 a2 – b2 = ab – b2
方程两边因式分解 (a + b)(a – b) = b(a – b)
方程两边消去公因子 (a +b) = b
代入假设 a = b 则 b + b = b
即 2b = b
或 2 = 1
哇！！！
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怎么会？为什么？
这阵子很忙，和大伙照面得少，祝大家快乐！ 
a = b a-b = 0 from step 4 to step 5, two sides divided by 0 了!  |
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