Tính nhanh: 138^2 + 124 × 138 + 62^2

Tính nhanh
1) 138^2 +124×138+62^2
2) 225^2 - 50×225+25^2
3) ( x- y + z )^2+(z- y )^2 + 2×(x - y + z ) × ( y- z )