Làm tính chia: [5(a – b)^3 + 2(a – b)^2] : (b – a)^2

Ta có: b – a= - (a- b) nên

b-a2=-a-b2=-12.a-b2=a-b2

5a-b3+2a-b2:b-a2=5a-b3+2a-b2:a-b2=5a-b3:a-b2+2a-b2:a-b2=5a-b+2