Question

38^2+76.12+12^2 tính nhanh

Answer 1

`#3107.101107`

`38^2 + 76*12 + 12^2`

`= (38)^2 + 2*38*12 + (12)^2`

`= (38 + 12)^2`

`= 50^2`

`= 2500`

______

Sử dụng hđt:

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

Answer 2

\(38^2+76\cdot12+12^2\)

\(=38^2+2\cdot38\cdot12+12^2\)

\(=\left(38+12\right)^2=50^2=2500\)