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\(\frac{1995\cdot1994-1}{1993\cdot1995+1994}=\frac{1995\cdot\left(1993+1\right)-1}{1993\cdot1995+1994}=\frac{1995\cdot1993+1995-1}{1993\cdot1995+1994}=\frac{1995\cdot1993+1994}{1995\cdot1993+1994}=1\)
![](https://rs.olm.vn/images/avt/0.png?1311)
1995(1996+1)-1/1996.1995+1994
1995.1996+1995-1/1996.1995+1994
1995.1996+1994/1996.1995+1994=1
\(\frac{1995.1997-1}{1996.1995+199}\)= \(\frac{1995.\left(1996+1\right)-1}{1996.1995+199}\)
= \(\frac{1995.1996+1995.1-1}{1996.1995+199}\)
= \(\frac{1995.1996+1994}{1996.1995+199}\)
làm đến đây thì mình chịu
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{1994\times1993-2}{1992+1992\times1994}=\frac{1994\times1992+1994-1}{1992+1992\times1994}=\frac{1994\times1992+1992}{1992+1992\times1994}=1\)
![](https://rs.olm.vn/images/avt/0.png?1311)
=1995*1994-1/(1994-1)*1995+1994
=1995*1994-1/1994*1995-1995+1994
=1995*1994-1/1994*1995-1
=1
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\(\frac{1994\cdot1993-2}{1992+1992-1994}\)
= \(\frac{1994\cdot1993-2}{1992+1992-1992-2}\)
= \(\frac{1994\cdot1993}{1992+1992-1992}=\frac{1994\cdot1993}{1992}=\frac{1987021}{996}.\)
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a) 2/5/7 = 2:5:7= 2/35
3/1/2 = 3: 1 : 2 = 3/2
Là : 3/2 : 35 x 2 = 3/35
b) \(\frac{1995\cdot1994-1}{1993\cdot1995+1994}=\frac{1995\cdot1993}{1993\cdot1995+1994}=\frac{1}{1994}\)
\(\frac{1995.1994-1}{1993.1995+1994}=\frac{1995\left(1993+1\right)-1}{1995.1993+1994}\)
\(=\frac{1995.1993+1995.1-1}{1995.1993+1994}=\frac{1995.1993+1994}{1995.1993+1994}\)
=1
Ông Thắng nhanh ghê