Current location - Training Enrollment Network - Mathematics courses - The class time is up to standard, and the eighth grade goes to math 18 pages.
The class time is up to standard, and the eighth grade goes to math 18 pages.
AB > AC, take a little E from AB, so AE=AC, even DE.

∫ad is the bisector of ∠BAC, ∴∠DAE=∠DAC,

Because AD is male marginal,

∴△ADE≌△ADC,(S,A,S),

∴DE=CD,

In the triangular bed, BE=AB-AE=AB-AC,

BD-DC=BD-DE, where be > BD-de,

∴ ab-AC > BD-DC (in a triangle, the difference between two sides is smaller than the third side).