Š¿Žšƒ‚ƒoƒCƒ‹ƒQ[ƒ€
Žc”O
slope =
1. “¤
2. â
3. ” 
4. “¤

ƒŒƒxƒ‹3. •ύX
SDAL“‡‰pŒêŠwZ