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\(\dfrac{2003x1999-2003x999}{2004x999+1004}\)
\(=\dfrac{2003x\left(1999-999\right)}{2004x\left(1000-1\right)+1004}\)
\(=\dfrac{2003x1000}{2004x1000-2004+1004}\)
\(=\dfrac{2003x1000}{2004x1000-1000}\)
\(=\dfrac{2003x1000}{\left(2004-1\right)x1000}\)
\(=\dfrac{2003x1000}{2003x1000}=1\)
\(B=\frac{1}{2}x\frac{2}{3}x\frac{3}{4}x\frac{4}{5}x...x\frac{2002}{2003}x\frac{2003}{2004}\)
\(B=\frac{1x2x3x4x...x2002x2003}{2x3x4x5x...x2003x2004}\)
Rút gọn các thừa số ở tử và mẫu ta được:
\(B=\frac{1}{2004}\)
Đ/S:\(\frac{1}{2004}\)
Ta có:
\(\left(1-\frac{1}{2}\right).\left(1-\frac{1}{3}\right)....\left(1-\frac{1}{2003}\right).\left(1-\frac{1}{2004}\right)\)
\(=\frac{1}{2}.\frac{2}{3}....\frac{2002}{2003}.\frac{2003}{2004}\)
\(=\frac{1.2....2002.2003}{2.3....2003.2004}\)
Đơn giản hết sẽ là:
\(=\frac{1}{2004}\)
\(\frac{1999}{2000}=1-\frac{1}{2000},\frac{2003}{2004}=1-\frac{1}{2004}\)
Có \(\frac{1}{2000}>\frac{1}{2004}\Leftrightarrow-\frac{1}{2000}< -\frac{1}{2004}\Leftrightarrow\frac{1999}{2000}< \frac{2003}{2004}\).
\(\frac{1999}{2000}\)= 0,9995
\(\frac{2003}{2004}\)= 0,999500998
Vì \(\frac{1999}{2000}< \frac{2003}{2004}\)0,000000998
=> \(\frac{1999}{2000}< \frac{2003}{2004}\)
a =2004.10+1992+2002+2004
= 2004(10+1)+3994
= 2004.11+3994=26038
b =2003(1+493+1520)=2003.2024=4054072
\(B=\left(1-\frac{1}{3}\right)\left(1-\frac{1}{4}\right)\left(1-\frac{1}{5}\right)\cdot....\cdot\left(1-\frac{1}{2003}\right)\left(1-\frac{1}{2004}\right)\)
\(=\frac{2}{3}\cdot\frac{3}{4}\cdot\frac{4}{5}\cdot....\cdot\frac{2002}{2003}\cdot\frac{2003}{2004}\)
\(=\frac{2\cdot3\cdot4\cdot...\cdot2002\cdot2003}{3\cdot4\cdot5\cdot...\cdot2003\cdot2004}=\frac{1}{1002}\)
2003*1999-2003*999
=(1999-999)*2003
=1000*2003
=2003000
2003000