TINH NHANH :
2004 * 2007 + 6 / 2005 * 2005 + 2009 =
LUU Y : DAU / CO NGHIA LA TREN HOAC [PHAN ] CUNG DUNG
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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
Tính nhanh: 2004 × 2007 + 6 2005 × 2005 + 2009
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) \(\frac{2005.2007-1}{2004+2005.2006}=\frac{\left(2014+1\right).2007-1}{2004+2005.2006}=\frac{2004+2005.2007-1}{2004+2005-2006}=\frac{2004+2005.2006}{2004+2005.2006}=1\)
Cho tam giac ABC co DT la 240cm2 . Tren canh AB lay diem D sao cho AB=8cm.Tren canh BC lay diem E sao cho BE=1/3BC.Biet DT BDE=16cm2.Tinh canh AB
MONG CAC BAN THONG CAM MINH KO VIET DUOC DAU CAC BAN CO DICH
AI NHANH TAY MINH TICH CHO BAN NAO LAM MINH CUNG TICHCA KE LAM SAU VA KET BAN VOI MINH
OK NHE
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
\(\frac{2004\times2007+6}{2005\times2005-2009}\)
\(=\frac{4022028+6}{4020025-2009}\)
\(=\frac{4022034}{4018016}.\)