Question

tính bằng cách hợp lí:

a, \(\dfrac{1996\cdot2011-1000}{996+2010\cdot1996}\)         b, \(\dfrac{45678\cdot1997+3333}{1998+45678-12345}\)

 

Answer 1

a.\(\dfrac{1996\cdot2011-1000}{996+2010\cdot1996}\)

\(=\dfrac{1996\cdot2011-1-1000}{996+4+2010\cdot1996}\)

\(=1\)

Answer 2

b,\(\dfrac{45678\cdot1997+3333}{1998+45678-12345}\)

\(=\dfrac{45678\cdot1998+3333}{1998+45678-12345}\)

\(=\dfrac{1111}{4115}\)