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標題:

• 800萬韓元=多少港元
• 科學記數法和十進制數,二進制數一問@1@
• 2 electrical questions@1@

• 800萬韓元=多少港元
• 科學記數法和十進制數,二進制數一問@1@
• 2 electrical questions@1@

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問一條數學題,,,THX : )

發問:

在圖中, PQ、AX 和 AY 都是直線。求X 。 圖: http://i586.photobucket.com/albums/ss309/lee123311/abdcc5c4.jpg THX : )

最佳解答:

we know the total degree of triangle is 180 so : 3x + ( 180 - (5x+55)) + 85 = 180 3x + (180-5x-55)+85 = 180 -2x +210 = 180 2x = 30 x= 15 Solved :)

其他解答:

angleACB=angleYCQ(對頂角) 3X+85=5X+55(三角形外角) 30 =2x x =15 2010-04-23 17:37:45 補充： To 001 and 002,無需要做甘多steps.......... 2010-04-23 19:18:11 補充： 要寫reason!!|||||angel BAC =3X angel ABC =180-(5X+55) angel ACB=85 Sum of interior angel of triangel =180 3X +(180-(5x+55)+85=180 3x+180-5x-55+86=180 180-55+86-180=5x-3x 31=2x x=15.5 2010-04-23 13:02:38 補充： Correct for some mistake angel BAC =3X angel ABC =180-(5X+55) angel ACB=85 Sum of interior angel of triangel =180 3X +(180-(5x+55)+85=180 3x+180-5x-55+85=180 180-55+85-180=5x-3x 3=2x x=15