1/2*5.7^2-5.7*3.7+1/2*3.7^299*101*10001+1

Question

1/2*5.7^2-5.7*3.7+1/2*3.7^2
99*101*10001+1

Answer 1

1.设X:5.7,Y:3.7
1/2X^2-XY+1/2Y^2=1/2(X^2-2XY+Y^2)=1/2(X-Y)^2
2.设X:100
(X-1)(X+1)(X^2+1)+1
注意观察规律