Question

diễn giải các hành đẳng thức đáng nhớ

Answer 1

Answer 2

1.(A+B )^2=A^2+2.AB+B^2

2.(A-B)^2=A^2-2.AB+B^2

3.A^2-B^2=(A+B).(A-B)

4.(A+B)^3=A^3+3.A^2.B+3.A.B^2+B^3

5.(A-B)^3=A^3-3.A^2.B+3.A.B^2-B^3

6.A^3+B^3=(A+B).(A^2-A.B+B^2)

7.A^3-A^3=(A-B).(A^2+AB+B^2)

Answer 3

1) \(\left(a+b\right)^2=a^2+2ab+b^2\)

2) \(\left(a-b\right)^2=a^2-2ab+b^2\)

3) \(a^2-b^2=\left(a-b\right)\left(a+b\right)\)

4) \(\left(a+b\right)^3=a^3+3a^2b+3ab^2+b^3\)

5) \(\left(a-b\right)^3=a^3-3a^2b+3ab^2-b^3\)

6) \(a^3+b^3=\left(a+b\right)\left(a^2-ab+b^2\right)\)

7) \(a^3-b^3=\left(a-b\right)\left(a^2+ab+b^2\right)\)