计算(1)根号1⼀3(2根号12-根号75)(2)a根号2b⼀a÷b根号2a⼀b

过程
2024-12-29 14:56:36
推荐回答(2个)
回答1:

(1)根号1/3(2根号12-根号75)
=(2根号4-根号25)
=4-5
=-1
(2)a根号2b/a÷b根号2a/b
=根号2ab÷根号2ab
=1

回答2:

(1)√(1/3)=(√3)/3; √12=2√3; √75=5√3
√(1/3) (2√12-√75)=[(√3)/3][4√3-5√3]=[(√3)/3](-√3)= -1;
(2)a√(2b/a)÷b√(2a/b)=a√(2b/a)×(1/b)√(b/2a)=(a/b)√[(2b/a)(b/2a)]=(a/b)|b/a|=1
这里b/a>0