Question

a) 2005*2007-1               b)2003*2004+2005*10+1994                

2004+2005*2006                 2005*2004-2003*2004

c)     ( 5+3/8+18+1/2-7-5/24 )

Answer 1

cai cho to cach day la phan nhe

 

Answer 2

c) 5 + \(\frac{3}{8}\)+18 + \(\frac{1}{2}\) - 7 - \(\frac{5}{24}\)

=\(\frac{43}{8}\)+ \(\frac{35}{2}\) +\(\frac{163}{24}\) 

=\(\frac{129}{24}\)+ \(\frac{420}{24}\)+\(\frac{163}{24}\)

= \(\frac{58}{51}\)

k nhé

Answer 3

\(\frac{2005\times2007-1}{\left(2005+2005\times2006\right)-1}=\)\(\frac{2005\times2007-1}{2005\left(1+2006\right)-1}=\frac{2005\times2007-1}{2005\times2007-1}=1\)