√55 × √3 ÷ √11
=(√5 × √11)× √3 ÷ √11
=?
(√5+ √3)(√5- √3)
=?
√12 × √75 × √18
=(√2^2 × 3) ×(√5^2 × √3) × ( √2 × √3^2)
=?
What should I do next?(2)
2009-04-09 1:00 am
回答 (1)
2009-04-09 1:31 am
✔ 最佳答案
1. √55 × √3 ÷ √11= (√5 × √11)× √3 ÷ √11
= √5 × √3
= √15
2. (√5+ √3)(√5- √3)
= √5^2 - √3^2
= 5 - 3
= 2
3. √12 × √75 × √18
= (√2^2 × √3) ×(√5^2 × √3) × ( √2 × √3^2)
= 2√3 × 5√3 × 3√2
= (2 × 5 × 3) × √3^2 × √2
= 30 × 3 × √2
= 90√2
收錄日期: 2021-04-13 16:33:05
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20090408000051KK01280