Tính nhanh: 2004 × 2007 + 6 2005 × 2005 + 2009
Tính nhanh 2004*2007+6/2005*2005+2009
Tham khảo
Ta có:
2004×2007+6
=(2005-1)×2007+6
=2005×2007-2007+6
=2005×(2005+2)-2007+6
=2005×2005+2005×2-2007+6
=2005×2005+4010-2007+6
=2005×2005+9
Vậy 2004×2007+6/2005×2005+2009=1
\(=4022028+6+2009\)
\(=4022034+2099\)
\(=4024043\)
\(\dfrac{2004\text{×}2007+6}{2005\text{×}2005+2009}\)
\(=\dfrac{\left(2005-1\right)\text{×}2007+6}{2005\text{×}2005+2009}\)
\(=\dfrac{2005\text{×}2007-2007+6}{2005\text{×}2005+2009}\)
\(=\dfrac{2005\text{×}\left(2005+2\right)-2007+6}{2005\text{×}2005+2009}\)
\(=\dfrac{2005\text{×}2005+2005\text{×}2-2007+6}{2005\text{×}2005+2009}\)
\(=\dfrac{2005\text{×}2005+2009}{2005\text{×}2005+2009}=1\)
`#PhuonggYaa.`
Tính nhanh
2004 x 2007 + 6 phần 2005 x 2005 + 2009
2004*2007+6/2005*2005+2009
=4022028+6+2009
=4022034+2009
=4024043
k cho minh nhe
1-2-3+4+5-6-7+8+2011-2002-2003+2004+2005-2006-2007+2008+2009=
Tính nhanh:
=(1-2-3+4)+(5-6-7+8)+...+(2005-2006-2007+2008)+2009
=2009
Tinh nhanh :
a) Tu so : 2005*2007-1
Mau so : 2004+2005*2006
b) Tu so : 2003*2004+2005*10+1994
Mau so: 2005*2004-2003*2004
a) \(\frac{2005.2007-1}{2004+2005.2006}=\frac{\left(2014+1\right).2007-1}{2004+2005.2006}=\frac{2004+2005.2007-1}{2004+2005-2006}=\frac{2004+2005.2006}{2004+2005.2006}=1\)
tính x=(2007^3*2001+2007(11*2007-6))/(2004*2005*2006*2007)
Tính nhanh
a)12/5 × 8 - 4 × 14 /5
b ) 2005 × 2007 - 1 / 2004 + 2005 ×2006
2004 nhân 2007 + 6/2005 nhân 2005 + 2009
2004 x 2007 +6/ 2005 x 2005 + 2009
2004 x 2007 + 6 / 2005 x 2005 - 2009
2004x2007+6/2005x2005-2009=4020025
\(\frac{2004\times2007+6}{2005\times2005-2009}\)
\(=\frac{4022028+6}{4020025-2009}\)
\(=\frac{4022034}{4018016}.\)