因式分解:2a(a+b)的平方-8ab的平方 计算:m-2+(m-2)分之1

问题描述:

因式分解:2a(a+b)的平方-8ab的平方 计算:m-2+(m-2)分之1

2a(a+b)^2-8ab^2
=2a(a^2+2ab+b^2)-8ab^2
=2a^3+4a^2b+2ab^2-8ab^2
=2a^3+4a^2b-6ab^2
=2a(a^2+2ab-3b^2)
=2a(a+3b)(a-b)
m-2+1/(m-2)
=(m-2)^2/m-2+1/(m-2)
=[(m-2)^2+1]/(m-2)
=(m^2-4m+4+1)/(m-2)
=(m^2-4m+5)/(m-2) (b^2-4ab