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\(\frac{1997x1996-1}{1995x1997+1996}\)
\(=\frac{1997x\left(1995+1\right)-1}{1997x1996+1996}\)
\(=\frac{1997x1995+1997-1}{1997x1995+1996}\)
\(=\frac{1997x1995+1996}{1997x1995+1996}\)
=1
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1997x1996-1/1995x1997+1996
=1997x(1995+1)-1/1995x1997-1996
=1997x1995+1997x1-1/1995x1997+1996
=1997x1995+1996/1995x1997+1996
=1
Tích nha
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A 16X5X9X3X4/3X5X16X9X4=1/1=1
B 1996X1995-1996X1/1994X1+1995X1994
=1995X(1996-1)/1995X(1994+1)=1995X1995/1995X1995
=1/1=1
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1998 x 1997 - 2= 3990006-2 = 3990004
1996 + 1996 x1998= 1996 x 1999= 3990004
\(\frac{1998x1997-2}{1996+1996x1998}=\frac{1998x\left(1996+1\right)-2}{1996+1996x1998}=\frac{1998x1996+1998-2}{1996+1996x1998}=\frac{1998x1996+1996}{1996+1996x1998}\)
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11x21x18/9x22x14
=231x18/9x22x14
=462x22x14
=10164x14
=142296
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\(\left(\frac{1}{3}-\frac{1}{5}\right)\times\frac{1}{2}=\frac{1}{6}-\frac{1}{10}\)
\(=\frac{1}{15}\)
\(\left(\frac{1}{3}-\frac{1}{5}\right)\times\frac{1}{2}=\frac{2}{15}\times\frac{1}{2}=\frac{1}{15}\)
\(\frac{1997x1996-1}{1995x1997+1996}\)
\(=\frac{1997x1996-1}{1995x1997+1997-1}\)
\(=\frac{1997x1996-1}{1997x\left(1995+1\right)-1}\)
\(=\frac{1997x1996-1}{1997x1996-1}\)
\(=1\)( vì tử số = mẫu số )
Tham khảo nha !!!
\(\frac{1997\times1996-1}{1995\times1997+1996}\)
= \(\frac{1997\times\left(1995+1\right)-1}{1995\times1997+1996}\)
= \(\frac{1997\times1995+1997-1}{1995\times1997+1996}\)
= \(\frac{1997\times1995+1996}{1995\times1997+1996}\)= 1