2=4−22=4-22=4−2
2=4−0−22=4-0-22=4−0−2
2=4−92+92−22=4-\displaystyle\frac{9}{2}+\displaystyle\frac{9}{2}-22=4−29+29−2
2=(4−92)2+92−22=\sqrt{(4-\displaystyle\frac{9}{2})^2}+\displaystyle\frac{9}{2}-22=(4−29)2+29−2
2=42−2×4×92+(92)2+92−22=\sqrt{4^2-2\times4\times \displaystyle\frac{9}{2}+(\displaystyle\frac{9}{2})^2}+\displaystyle\frac{9}{2}-22=42−2×4×29+(29)2+29−2
2=42−4×9+(92)2+92−22=\sqrt{4^2-4\times9+(\displaystyle\frac{9}{2})^2}+\displaystyle\frac{9}{2}-22=42−4×9+(29)2+29−2
2=16−36+(92)2+92−22=\sqrt{16-36+(\displaystyle\frac{9}{2})^2}+\displaystyle\frac{9}{2}-22=16−36+(29)2+29−2
2=−20+(92)2+92−22=\sqrt{-20+(\displaystyle\frac{9}{2})^2}+\displaystyle\frac{9}{2}-22=−20+(29)2+29−2
2=25−45+(92)2+92−22=\sqrt{25-45+(\displaystyle\frac{9}{2})^2}+\displaystyle\frac{9}{2}-22=25−45+(29)2+29−2
2=52−2×5×92+(92)2+92−22=\sqrt{5^2-2\times5\times\displaystyle\frac{9}{2}+(\displaystyle\frac{9}{2})^2}+\displaystyle\frac{9}{2}-22=52−2×5×29+(29)2+29−2
2=(5−92)2+92−22=\sqrt{(5-\displaystyle\frac{9}{2})^2}+\displaystyle\frac{9}{2}-22=(5−29)2+29−2
2=5−92+92−22=5-\displaystyle\frac{9}{2}+\displaystyle\frac{9}{2}-22=5−29+29−2
2=5−22=5-22=5−2
2=32=32=3
1+1=31+1=31+1=3
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