3(b-8)=a+8b a-8=b+8
(2a+b)(a-b)=8 求a,b
证明:8(a+b+c)^3-(b+c)^3-(c+a)^3-(a+b)^3=3(2a+b+c)(a+2b+c)(a+b+
已知|a|=6,|b|=8,且|a+b|=|a-b|,求|a-b|.
已知|a|=6 |b|=8,且|a+b|= |a-b| 求|a-b|
如果a-2b/a+2b=3,求a+2b/a-2b+3a-6b/4a+8b
(a-2b)/(a+2b)=3,求(a+2b)/(a-2b)+(3a-6b)/(4a+8b)的解,
解方程组:9(a+b)+(a-b)=25,2(a+b)-(a-b)=8
a-2b/a+2b=3,求2+2b/a-2b+3a-6b/4a+8b的值
3a^2b-{2a^2b+[9a^b-(6a^2b+4a^2)]-(3a^2b-8a^2)}=
(3a-6b)/(a+b) - (5a-6b)/(a-b) - (4a-5b)/(a+b) - (7a-8b)/(a-b
(3a-6b/a+b)-(5a-6b/a-b)-(4a-5b/a+b)-(7a-8b/b-a)
根号3a-b-c+根号a-2b+c+3=根号a+b-8+根号8-a-b