chứng minh:12341234/45674567=1234/4567
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12341234 . 5678 - 56785678 .1234
= 1234.10001 . 5678 - 5678.10001.1234
= 0
Đề thiếu z
Ta có: \(\dfrac{1}{10001}=\dfrac{1234}{x}=\dfrac{y}{45674567}=\dfrac{2345}{t}\)
\(\Rightarrow\left\{{}\begin{matrix}x=1234.10001=12341234\\y=\dfrac{45674567}{10001}=4567\\t=2345.10001=23452345\end{matrix}\right.\)
Vì 1/10001 = 1234/x => x = 10001.1234 = 12341234
Vì 1/10001 = y/45674567 => y = y.10001 = 45674567 <=>
y = 4567
Vì 1/10001 = 2345/t => t = 10001.2345 = 23452345
Vậy...
Answer:
\(\frac{1}{10001}=\frac{1234}{x}=\frac{y}{45674567}=\frac{2345}{t}\)
\(\Rightarrow\hept{\begin{cases}x=1234.10001=12341234\\y=45674567:10001=4567\\t=2345.10001=23452345\end{cases}}\)
4567 + 1234 -4567 -4
= 4567 - 4567 + 1234 - 4
= 0+ 1230
= 1230
\(4567+\left(1234-4567\right)-4\)
\(=4567+1234-4567-4\)
\(=\left(4567-4567\right)+\left(1234-4\right)\)
\(=0+1230\)
\(=1230\)
a) Ta có: \(4567+1234-4567-\left(-66\right)\)
\(=4567-4567+1234+66\)
\(=1234+66=1300\)
b) Ta có: \(2004-15+54-2004-54\)
\(=\left(2004-2004\right)+\left(54-54\right)-15\)
\(=0+0-15\)
\(=-15\)
c) Ta có: \(-45789-357-45789+57\)
\(=-91578-300=-91878\)
\(1)5-(1997-2005)+1997\)
\(=5-1997+2005+1997\)
\(=(-1997+1997)+(5+2005)\)
\(=0+2010\)
\(=2010\)
\(2)4567+(1234-4567)-4\)
\(=4567+1234-4567-4\)
\(=(4567-4567)+(1234-4)\)
\(=0+1230\)
\(=1230\)
\(\frac{12341234}{4564567}\)
\(=\frac{12341234\div10001}{45674567\div10001}\)
\(=\frac{1234}{4567}\)
p/s: hok tốt nhé
Ta có :
\(\frac{12341234}{45674567}\)= \(\frac{12341234:10001}{45674567:10001}\)
= \(\frac{1234}{4567}\)
=> ( \(\frac{12341234}{45674567}\)= \(\frac{1234}{4567}\)) = \(\frac{1234}{4567}\)
=> đpcm