Maths problem: how to do 17(a) , thanks.?
回答 (2)
2020-11-17 8:47 pm
讓ｘ代表他的高度．
因為立體ＶＰＱＲＳ與立體ＶＡＢＣＶ是全等立體．
故：
x : (x+12) = 5:15
=> x/(x+12) = 5/15 = 1/3
=> 3x = x+12 (cancel 1x on both sides)
=> 2x = 12
=> x = 6
超簡易的耶！
因為立體ＶＰＱＲＳ與立體ＶＡＢＣＶ是全等立體．
故：
x : (x+12) = 5:15
=> x/(x+12) = 5/15 = 1/3
=> 3x = x+12 (cancel 1x on both sides)
=> 2x = 12
=> x = 6
超簡易的耶！
2020-11-20 4:09 pm
x : (x + 12) = 2.5 : 7.5
x = 6
x = 6
收錄日期: 2021-04-24 08:04:50
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20201117111432AAhBMK2