2根號3-根號7分之5根號3-(2+根號3)(2-根號3)?

2016-02-06 3:16 am

回答 (1)

2016-02-06 9:52 am

2√3-(5√3)/√7 -(2+√3)(2-√3)
=(√3)(2-√7 /7)-(2-3)
=(√3)(14-√7)/7 +1
=(14√3 -√21 +7)/7

👍 0 👎 0