(1)2√b^4/12a(a>0)
=2b²/6a×√3a;
=b²/(3a)×√(3a);
(2)√x^4y^2+x^2y^4(x大于等于0y大于等于0)
=xy√(x²+y²);
(3)若x0)
=5xy²√(2x);
(6)√27(a+b)^4
=3(a+b)²√3;
(7)√2a^2+4ab+2b^2
=√2|a+b|;
(8)√(a^2-b^2)(a+b)(a>b>0)
=(a+b)√(a-b);
(9)√5y/7x(x>0)
=(1/7x)√(35xy);
(10)1/a√3a/8b(b>0)
=(1/a)×(1/4b)√(6ab)
=1/(4ab)√(6ab);
(11)3√1/3(x+y)(x>0,y>0)
=1/(x+y)√3(x+y);
(12)√54/(m-n)^3
=3/(m-n)²√6(m-n);
很高兴为您解答,skyhunter002为您答疑解惑
如果本题有什么不明白可以追问,
能不能说一下第二第10第8题的具体步骤啊我明天要考试啊说一下吧
(2)√x^4y^2+x^2y^4(x大于等于0y大于等于0)提取公因式x²y²;为x²y²(x²+y²);然后开根号;=xy√(x²+y²);(8)√(a^2-b^2)(a+b)(a>b>0)=√(a+b)(a-b)(a+b)=√(a+b)²(a-b)=(a+b)√(a-b);(10)(10)1/a√3a/8b(b>0)∵3a/8b>0,b>0;∴a>0;=1/a×√(3a×2b)/(8b×2b)=(1/a)×(1/4b)√(6ab)=1/(4ab)√(6ab);