四邊形同正方形既未知數0.0得先好入''

2011-11-16 4:16 am
求下列各長方形PQRS中的未知數。<--張紙既大題目來
綠色果D係外框來,唔洗理佢咖

5.
圖片參考:http://imgcld.yimg.com/8/n/HA07620410/o/701111150088113873401860.jpg

6.
圖片參考:http://imgcld.yimg.com/8/n/HA07620410/o/701111150088113873401871.jpg

7.
圖片參考:http://imgcld.yimg.com/8/n/HA07620410/o/701111150088113873401872.jpg

8.
圖片參考:http://imgcld.yimg.com/8/n/HA07620410/o/701111150088113873401883.jpg

9.
圖片參考:http://imgcld.yimg.com/8/n/HA07620410/o/701111150088113873401884.jpg

10.
圖片參考:http://imgcld.yimg.com/8/n/HA07620410/o/701111150088113873401895.jpg

11.
圖片參考:http://imgcld.yimg.com/8/n/HA07620410/o/701111150088113873401896.jpg

12.
圖片參考:http://imgcld.yimg.com/8/n/HA07620410/o/701111150088113873401907.jpg

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下列各題中,FGHI為一正方形,求圖中的未知數。
13.
圖片參考:http://imgcld.yimg.com/8/n/HA07620410/o/701111150088113873401908.jpg

14.
圖片參考:http://imgcld.yimg.com/8/n/HA07620410/o/701111150088113873401919.jpg

15.
圖片參考:http://imgcld.yimg.com/8/n/HA07620410/o/7011111500881138734019110.jpg

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回答 (2)

2011-11-16 4:55 am
✔ 最佳答案

圖片參考:http://imgcld.yimg.com/8/n/HA04628698/o/701111150088113873401910.jpg

5)

y - 2 = 3
y = 5

4x = 8
x = 2



圖片參考:http://imgcld.yimg.com/8/n/HA04628698/o/701111150088113873401921.jpg

6)

y + 4 = 5
y = 1

x = 5



圖片參考:http://imgcld.yimg.com/8/n/HA04628698/o/701111150088113873401922.jpg

7)

a + 30° = 90°
a = 60°

b = 180 - 30 - 30 = 120°


圖片參考:http://imgcld.yimg.com/8/n/HA04628698/o/701111150088113873401923.jpg

8)

a = (180 - 74)/2 = 53°

b + b = 74°
b = 37°


圖片參考:http://imgcld.yimg.com/8/n/HA04628698/o/701111150088113873401934.jpg

9)

4x = 3x + 2
x = 2


圖片參考:http://imgcld.yimg.com/8/n/HA04628698/o/701111150088113873401935.jpg

10)

a + a = 74°
a = 37°

a + b = 90°
b = 90 - 37 = 53°


圖片參考:http://imgcld.yimg.com/8/n/HA04628698/o/701111150088113873401936.jpg

11)

2x + 10° = 45°
x = 17.5°

7y = 14
y = 2


圖片參考:http://imgcld.yimg.com/8/n/HA04628698/o/701111150088113873401947.jpg

12)

a + 45° = 99°
a = 54°

a + b = 90°
b = 90 - 54 = 36°


圖片參考:http://imgcld.yimg.com/8/n/HA04628698/o/701111150088113873401948.jpg

13)

2a + 2 = 6
a = 2

(b * b / 2) * 4 = 6 * 6
b = 3√2


圖片參考:http://imgcld.yimg.com/8/n/HA04628698/o/701111150088113873401949.jpg

14)

b = 90 - 62 = 28°

a + b = 45°
a = 45 - 28 = 17°


圖片參考:http://imgcld.yimg.com/8/n/HA04628698/o/7011111500881138734019510.jpg

15)

b = 34° + 90° = 124°

a = 34° + 45° = 79°

2011-11-15 20:59:40 補充:
修正 :

11)

2x + 10° = 45°
改為

2x + 10° = 90°
x = 40°

2011-11-15 21:01:17 補充:
打得好辛苦 , 唔好移除我。
2011-11-16 5:05 am
ok...........


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