😃1.5 不等式

https://www.geogebra.org/m/qWKKhnvU

https://www.geogebra.org/m/PUXZcCTJ

https://www.geogebra.org/m/ubFgtQcw

https://www.geogebra.org/m/NvqgrzRd

https://www.geogebra.org/m/H7aPNSNQ