Question

 TÍNH \(\frac{2000}{123456^2-123457.123455}\)

-" Hoàng Phúc"

Answer 1

\(\frac{2000}{123456^2-123457.123455}=\frac{2000}{123456^2-\left(123456+1\right).123455}=\frac{2000}{123456^2-123456.123455-123455}=\frac{2000}{123456.\left(123456-123455\right)-123455}\)

\(=\frac{2000}{123456.1-123455}=\frac{2000}{1}=2000\)

Answer 2

đặt a=123456

Answer 3

=2000/1=2000

cậu chú ý tách cái mẫu số ra là đc

Answer 4

\(=\frac{2000}{a^2-\left(a+1\right)\left(a-1\right)}=\frac{2000}{a^2-a^2+1}=2000\)