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Mình làm cau thứ hai còn câu trước giống như vậy
2004 x 2005 - 2004 x 2002
=2004 x (2005 -2002)
=2004 x 3
=6012tick nha
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Đề đúng : So sánh : \(\frac{2003}{2004}+\frac{2004}{2005}+\frac{2005}{2006}\)với 3
Ta có :
\(\frac{2003}{2004}< \frac{2004}{2004}=1\)
\(\frac{2004}{2005}< \frac{2005}{2005}=1\)
\(\frac{2005}{2006}< \frac{2006}{2006}=1\)
\(\Rightarrow\frac{2003}{2004}+\frac{2004}{2005}+\frac{2005}{2006}< 1+1+1\)
\(\Rightarrow\frac{2003}{2004}+\frac{2004}{2005}+\frac{2005}{2003}< 3\)
Chúc bạn học tốt !!!
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1)2003x2005+200 2)2004x2004+199
=(200x10+3)x2005+200 =2004x2004+(200-1)
=200x10x2005+3x2005+200 =2004x2004+200-1
=200x(10x2005+1)+3x2005 =(200x10+4)x2004+200-1
=200x20051+6015 =200x10x2004+4x2004+200-1
=4010200+6015 =200x(10x2004+1)+4x2004-1
=4016215 =200x20041+8016-1
=4008200+8015 =4016215
chọn mình nha
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2002 x 2005 1005 / 2003 x 2005 - 1000 = 2002 : 2002 x 2005 + 1005 / 2002 : 2002 x 2005 + ( 2003 - 2002 ) x 2005 - 1000
= 1 x 2005 + 1005 / 1 x 2005 + 1 x 2005 - 1000
= 2005 + 1005 / 2005 + 2005 - 1000
= 3010 / 4010 - 1000
= 3010 / 3010 = 1
2002x2005+1005=4015015
2004x2005-1000=4015015