Question

tính nhanh

a) 75^2 - 25^2

b) 37^2 - 13^2

c) 2002^2 - 2^2

Answer 1

a) \(75^2-25^2=(75-25)(75+25)=50.100=5000\)

b) \(37^2 - 13^2=(37-13)(37+13)=24.50=1200\)

c) \(2002^2 - 2^2=(2002-2)(2002+2)=2000.2004=4008000 \)

Answer 2

Câu a :

\(75^2-25^2=\left(75-25\right)\left(75+25\right)=50.100=5000\)

Câu b :

\(37^2-13^2=\left(37-13\right)\left(37+13\right)=24.50=1200\)

Câu c :

\(2002^2-2^2=\left(2002-2\right)\left(2002+2\right)=2000.2004=4008000\)