化簡下列根式http://postimg.org/image/u9e3n70fz/?
回答 (2)
2016-01-01 3:44 am
Sol
(a)
√8*(－√54)*(－√15)
=√8*√54√15
=√(8*54*15)
=√(2^3*2*3^3*3*5)
=√(2^4*3^4*5)
=(2^2*3^2)*√5
=36√5
(b)
√45/√90
=√(45/90)
=√(1/2)
=√(2/4)
=√2/2
(a)
√8*(－√54)*(－√15)
=√8*√54√15
=√(8*54*15)
=√(2^3*2*3^3*3*5)
=√(2^4*3^4*5)
=(2^2*3^2)*√5
=36√5
(b)
√45/√90
=√(45/90)
=√(1/2)
=√(2/4)
=√2/2
2016-01-01 7:12 am
(a)
√8*(－√54)*(－√15)
=(2√2)(3√(2*3))(√(5*3))
=6*2*3√5
=36√5
(b)
√45/√90 *√8
=√(45/90) *√8
=√(1/2) *2√2
=√(2/4) *2√2
=√2/2*2√2
=2
√8*(－√54)*(－√15)
=(2√2)(3√(2*3))(√(5*3))
=6*2*3√5
=36√5
(b)
√45/√90 *√8
=√(45/90) *√8
=√(1/2) *2√2
=√(2/4) *2√2
=√2/2*2√2
=2
收錄日期: 2021-04-18 14:19:30
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20151231174431AA0jByG