证明 1+1=3

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1+1=3 ？

∵1+1=2 =4-2 =4-0-2 =4-\cfrac{9}{2}+\cfrac{9}{2}-2 =\sqrt{(4-\cfrac{9}{2})^2}+\cfrac{9}{2}-2 =\sqrt{4^2-2\times4\times \cfrac{9}{2}+\left(\cfrac{9}{2}\right)^2}+\cfrac{9}{2}-2 =\sqrt{4^2-4\times9+\left(\cfrac{9}{2}\right)^2}+\cfrac{9}{2}-2 =\sqrt{16-36+\left(\cfrac{9}{2}\right)^2}+\cfrac{9}{2}-2 =\sqrt{-20+\left(\cfrac{9}{2}\right)^2}+\cfrac{9}{2}-2 =\sqrt{25-45+\left(\cfrac{9}{2}\right)^2}+\cfrac{9}{2}-2 =\sqrt{5^2-2\times5\times\cfrac{9}{2}+\left(\cfrac{9}{2}\right)^2}+\cfrac{9}{2}-2 =\sqrt{\left(5-\cfrac{9}{2}\right)^2}+\cfrac{9}{2}-2 =5-\cfrac{9}{2}+\cfrac{9}{2}-2 =5-2 =3 ∴可以证明1+1=3