C=2005/2+...+2005/2005
D=2006/1+2007/2+...+4009/2004
Tính C-D
Những câu hỏi liên quan
c = 2005/2 + 2005/3+ 2005/4+....+ 2005/2005 , d = 2006 / 1 + 2006 / 2 + 2006 / 3 +....+ 4009 / 2004 tính c-d
c = 2005/2 + 2005/3+ 2005/4+....+ 2005/2005 , d = 2006 / 1 + 2006 / 2 + 2006 / 3 +....+ 4009 / 2004 tính c-d
mik ko bít
I don't now
................................
.............
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c = 2005/2 + 2005/3+ 2005/4+....+ 2005/2005 , d = 2006 / 1 + 2006 / 2 + 2006 / 3 +....+ 4009 / 2004 tính c-d
c = 2005/2 + 2005/3+ 2005/4+....+ 2005/2005 , d = 2006 / 1 + 2006 / 2 + 2006 / 3 +....+ 4009 / 2004 tính c-d
mong các bạn giải sớm cho mk nha xin cảm ơn
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Tìm C, D
C = 2005/2 + 2005/3+ 2005/4+....+ 2005/2005
D = 2006 / 1 + 2006 / 2 + 2006 / 3 +....+ 4009 / 2004
Cho frac{a}{b}frac{c}{d}. Chứng minh:a) frac{left(a-bright)^3}{left(c-dright)^3}frac{3a^2+2b^2}{3c^2+2d^2}b)frac{4a^4+5b^4}{4c^4+5d^4}frac{a^2b^2}{c^2d^2}c)left(frac{a-b}{c-d}right)^{2005}frac{2a^{2005}-b^{2005}}{2c^{2005}-d^{2005}}d)frac{2a^{2005}+5b^{2005}}{2c^{2005}+5d^{2005}}frac{left(a+bright)^{2005}}{left(c+dright)^{2005}}e)frac{left(20a^{2006}+11b^{2006}right)^{2007}}{left(20a^{2007}-11b^{2007}right)^{2006}}frac{left(20c^{2006}+11d^{2006}right)^{2007}}{left(20c^{2007}-11d^{2007}right)^{20...
Đọc tiếp
Cho \(\frac{a}{b}=\frac{c}{d}\). Chứng minh:
a) \(\frac{\left(a-b\right)^3}{\left(c-d\right)^3}=\frac{3a^2+2b^2}{3c^2+2d^2}\)
b)\(\frac{4a^4+5b^4}{4c^4+5d^4}=\frac{a^2b^2}{c^2d^2}\)
c)\(\left(\frac{a-b}{c-d}\right)^{2005}=\frac{2a^{2005}-b^{2005}}{2c^{2005}-d^{2005}}\)
d)\(\frac{2a^{2005}+5b^{2005}}{2c^{2005}+5d^{2005}}=\frac{\left(a+b\right)^{2005}}{\left(c+d\right)^{2005}}\)
e)\(\frac{\left(20a^{2006}+11b^{2006}\right)^{2007}}{\left(20a^{2007}-11b^{2007}\right)^{2006}}=\frac{\left(20c^{2006}+11d^{2006}\right)^{2007}}{\left(20c^{2007}-11d^{2007}\right)^{2006}}\)
f)\(\frac{\left(20a^{2007}-11c^{2007}\right)^{2006}}{\left(20a^{2006}+11c^{2006}\right)^{2007}}=\frac{\left(20b^{2007}-11d^{2007}\right)^{2006}}{\left(20b^{2006}+11d^{2006}\right)^{2007}}\)
ừ, bạn bik làm thì giúp mình nha ^^
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Cho a/b=c/d chứng tỏ (2005.a-2006.b)/(2006.c-2007.d)=(2005.c-2006.d)/(2006.a-2007.b)
CHO a/b c/d . Chứng minh1) a2004- b2004 / a2004 + b2004 c2004- d2004 / c2004 + d20042) (a2004+ b 2004) 2005/(c2004+d2004) 2005 (a2005 - b 2005) 2004/ (c2005 - d2005) 20043) (20a2006 +11b2006) 2007 /(20a200711b2007) 2006 (20c2006+ 11d2006) 2007 / (20c2007- 11d 2007)2006
Đọc tiếp
CHO a/b = c/d . Chứng minh
1) a2004- b2004 / a2004 + b2004 = c2004- d2004 / c2004 + d2004
2) (a2004+ b 2004) 2005/(c2004+d2004) 2005 = (a2005 - b 2005) 2004/ (c2005 - d2005) 2004
3) (20a2006 +11b2006) 2007 /(20a200711b2007) 2006
= (20c2006+ 11d2006) 2007 / (20c2007- 11d 2007)2006
a,21^10-1:200
b,39^20+39^13:40
c,2^60+5^30:41
d,2005^2007+2007^2005:2006
ai tích mình mình tích lại cho
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ta có:
\(2^{60}+5^{30}\)
=\(\left(2^4\right)^{15}+\left(5^2\right)^{15}\)
=\(16^{15}+15^{15}\) luôn chia hết cho 16 + 25 = 41
\(\Rightarrow2^{60}+5^{30}\) chia hết cho 41 ( đpcm )
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