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F.2 數學題 10點
2011-02-08 6:53 pm
回答 (3)
2011-02-08 8:34 pm
✔ 最佳答案
to remenber that all sum of ext. ∠=360(ext ∠ of polygon)∴
43.
52+63+83+97+(180-y)=360
y= 115
44.
x+x+x+x+20+x+20+x+20+90=360
3(2x+50)=360
2x+50=120
x=70/2=35
45.
56+56+124+(180-y)=360
416-y=360
y=56
that's it
2011-02-13 3:21 am
1)
a=180-83
=97
b=180-52
=128
c=180-97
=83
d=180-63
=117
a+b+c+d+y=(n-2)X180
97+128+83+117+y=(5-2)X180
425+y=3X180
425+y=540
y=540-425
y=115
2)
x+x+x+(x+20)+(x+20)+(x+20)+90=360
x+x+x+x+20+x+20+x+20+90=360
6x+150=360
6x=210
x=35
3)side abc=180-56
=124
side bcd=180-124
=56
side cda=180-56
=124
so
124+124+56+y=(4-2)X180
304+y=360
y=360-304
y=56
a=180-83
=97
b=180-52
=128
c=180-97
=83
d=180-63
=117
a+b+c+d+y=(n-2)X180
97+128+83+117+y=(5-2)X180
425+y=3X180
425+y=540
y=540-425
y=115
2)
x+x+x+(x+20)+(x+20)+(x+20)+90=360
x+x+x+x+20+x+20+x+20+90=360
6x+150=360
6x=210
x=35
3)side abc=180-56
=124
side bcd=180-124
=56
side cda=180-56
=124
so
124+124+56+y=(4-2)X180
304+y=360
y=360-304
y=56
2011-02-08 7:33 pm
1)
a=180-83
=97
b=180-52
=128
c=180-97
=83
d=180-63
=117
a+b+c+d+y=(n-2)X180
97+128+83+117+y=(5-2)X180
425+y=3X180
425+y=540
y=540-425
y=115
2)
x+x+x+(x+20)+(x+20)+(x+20)+90=360
x+x+x+x+20+x+20+x+20+90=360
6x+150=360
6x=210
x=35
3)side abc=180-56
=124
side bcd=180-124
=56
side cda=180-56
=124
so
124+124+56+y=(4-2)X180
304+y=360
y=360-304
y=56
a=180-83
=97
b=180-52
=128
c=180-97
=83
d=180-63
=117
a+b+c+d+y=(n-2)X180
97+128+83+117+y=(5-2)X180
425+y=3X180
425+y=540
y=540-425
y=115
2)
x+x+x+(x+20)+(x+20)+(x+20)+90=360
x+x+x+x+20+x+20+x+20+90=360
6x+150=360
6x=210
x=35
3)side abc=180-56
=124
side bcd=180-124
=56
side cda=180-56
=124
so
124+124+56+y=(4-2)X180
304+y=360
y=360-304
y=56
參考: me
收錄日期: 2021-04-13 17:49:33
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20110208000051KK00406