数学题来帮忙。。。
展开全部
81a^4-16b^4
=(9a²-4b²搭悔野)(9a²+4b²)
=(3a-2b)(3a+2b)(9a²+4b²前燃)
a-b-(a²-b²)
=(a-b)-(a-b)(a+b)
=(a-b)[1-(a+b)]
=(a-b)(1-a-b)
-(x-y+z)²+(x+y+z)²知喊
=(x+y+z)²-(x-y+z)²
=[(x+y+z)-(x-y+z)][(x+y+z)+(x-y+z)]
=(x+y+z-x+y-z)(x+y+z+x-y+z)
=(2y)(2x+2z)
=4y(x+z)
-x^3+x^5
=x^5-x^3
=x³(x²-1)
=x³(x+1)(x-1)
=(9a²-4b²搭悔野)(9a²+4b²)
=(3a-2b)(3a+2b)(9a²+4b²前燃)
a-b-(a²-b²)
=(a-b)-(a-b)(a+b)
=(a-b)[1-(a+b)]
=(a-b)(1-a-b)
-(x-y+z)²+(x+y+z)²知喊
=(x+y+z)²-(x-y+z)²
=[(x+y+z)-(x-y+z)][(x+y+z)+(x-y+z)]
=(x+y+z-x+y-z)(x+y+z+x-y+z)
=(2y)(2x+2z)
=4y(x+z)
-x^3+x^5
=x^5-x^3
=x³(x²-1)
=x³(x+1)(x-1)
展开全部
【(3a+2b)(3a-2b)】燃歼^2
(a-b)(1-a-b)知段差
4y(x+z)搭皮
x^3(x+1)(x-1)
x^m+1(a^2x-1)(a^2x+1)
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