∵MN⊥AB,∴由勾股定理,有:AN^2=AM^2-MN^2、BN^2=BM^2-MN^2,
∴AN^2-BN^2=AM^2-BM^2.
∵CM=BM,∴AN^2-BN^2=AM^2-CM^2.······①
∵AC⊥CM,∴AC^2=AM^2-CM^2.······②
由①、②,得:AN^2-BN^2=AC^2.
请及时采纳 谢谢哦
∵MN⊥AB,∴由勾股定理,有:AN^2=AM^2-MN^2、BN^2=BM^2-MN^2,
∴AN^2-BN^2=AM^2-BM^2.
∵CM=BM,∴AN^2-BN^2=AM^2-CM^2.······①
∵AC⊥CM,∴AC^2=AM^2-CM^2.······②
由①、②,得:AN^2-BN^2=AC^2.
请及时采纳 谢谢哦