计算:(3a+1/2b)(3a-1/2b)(9a^2-1/4b^2)=?分解因式 :9x^2y^2-16z^2+?

问题描述:

计算:(3a+1/2b)(3a-1/2b)(9a^2-1/4b^2)=?分解因式 :9x^2y^2-16z^2+?
(c-3)ab-(3-c)a^2b^2=?解方程:2^m=a 32^n=b,求2^3m+10n
分解因式 :9x^2y^2-16z^2=?

(3a+1/2b)(3a-1/2b)(9a^2-1/4b^2)=(9a^2-1/4b^2)^2=81a^4-9/2a^2b^2+1/16b^4
分解因式 :9x^2y^2-16z^2+?---------?不懂,看不明白
(c-3)ab-(3-c)a^2b^2=ab(c-3)(1+ab)
解方程:2^m=a 32^n=b,求2^3m+10n
2^5n=b
∴原式=(2^m)^3*(2^5n)^2=a^3b^2分解因式 :9x^2y^2-16z^2=?打错了= =!9x^2y^2-16z^2=(3xy+4z)(3xy-4z)