a^3*b^6-a^3*b^9
先化简,再求值:(2a-b)^2-(2a+b)(a-b)-3(a-3b)(a+3b),其中|a-1|+b^2=6b-9
(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)
当a+2b/2a-3b=3,求代数式4b+2a/9b-6a-4a-6b/3a+6b
a+2b/2a-3b=3 求解4b+2a/9b-6a-4a-6b/3a+6b=?
计算(3a-2b)(9a*a+6ab+4b*b)-(3a+2b)(9a*a-6ab+4b*b)
3a^2b-{2a^2b+[9a^b-(6a^2b+4a^2)]-(3a^2b-8a^2)}=
(3a-2b)(9a+6b)
(3a+2b)(6a-5b)(2b-3a)(5a+6b)
(a+2b)(2a+4b)(3a+6b)(4a+8b)
(b-a)^3+6(a-b)^2+9(b-a)因式分解,
[a+b][a-b]+3a