Question

因式分解:1、m^2(m-1)+(1-m) 2、9-16(a-b)^2

Answer 1

m^2(m-1)+(1-m)=m^2(m-1)-(m-1)

=(m-1)(m^2-1)

=(m+1)(m-1)^2

9-16(a-b)^2=3^2-[4(a-b)]^2

=[3+4(a-b)][3-4(a-b)]

=(4a-4b+3)(4b-4a+3)