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+/ \(\frac{16.25+44.100}{29.96+142.48}=\frac{16.25+4.11.100}{29.96+71.2.48}\) +/\(\frac{1996.1995-996}{1000+1996.1994}=\frac{\left(1995+1\right).1995-996}{1000+1996\left(1995-1\right)}\)
\(=\frac{400+400.11}{29.96+71.96}=\frac{400\left(1+11\right)}{96\left(29.71\right)}\) \(=\frac{1995.1995+1995-996}{1000+1996.1995-1996}\)
\(=\frac{400.12}{96.2059}=\frac{50.96}{96.2059}=\frac{50}{2059}\) \(=\frac{1995\left(1995+1\right)-996}{1996.1995-996}=1\)
T i c k cho chị nha ^^ Lát chị làm tiếp cho giờ chị đi ăn cơm đã ^.<
\(\frac{1996.1995-996}{1000+1996.1994}=\frac{\left(1995+1\right).1995-996}{1996\left(1995-1\right)+1000}\)
\(=\frac{1995.1995+1995-996}{1996.1995-1996+1000}\)
\(=\frac{1995\left(1995+1\right)-996}{1995.1996-996}\)
\(=\frac{1995.1996-996}{1995.1996-996}=1\)
a) \(\frac{399\times45+55\times399}{1995\times1996-1991\times1995}=\frac{399\times\left(45+55\right)}{1995\times\left(1996-1991\right)}=\frac{399\times100}{1995\times5}=4\)
b) \(\frac{1996\times1995-996}{1000+1996\times1994}=\frac{1996\times\left(1994+1\right)-996}{1000+1996\times1994}=\frac{1996\times1994+1996-996}{1000+1996\times1994}\)
\(=\frac{1996\times1994+1000}{1000+1996\times1994}=1\)
c) \(\frac{637\times527-189}{526\times637+448}=\frac{637\times\left(526+1\right)-189}{526\times637+448}=\frac{637\times526+637-189}{526\times637+448}=\frac{637\times526+448}{526\times637+448}=1\)
d) \(\frac{677\times874+251}{678\times874-623}=\frac{677\times874+251}{874\times\left(677+1\right)-623}=\frac{677\times874+251}{874\times677+874-623}=\frac{677\times874+251}{874\times677+251}=1\)
a) \(15\times\frac{2121}{4343}+15\times\frac{222222}{434343}=15\times\frac{21}{43}+15\times\frac{22}{43}=15\times\left(\frac{21}{43}+\frac{22}{43}\right)=15\times1=15\)
b) \(\frac{16\times25+44\times100}{29\times96+142\times48}=\frac{25\times\left(16+44\times4\right)}{48\times\left(29\times2+142\right)}=\frac{25\times192}{48\times200}=\frac{4}{8}=\frac{1}{2}\)
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\(\frac{637\times527-189}{526\times637+448}\)
\(=\frac{637\times\left(526+1\right)-189}{526\times637+448}\)
\(=\frac{637\times526+637-189}{526\times637+448}\)
\(=\frac{637\times526+448}{526\times637+448}\)
\(=1\)
\(\frac{677\times874+251}{678\times874-623}\)
\(=\frac{677\times874+251}{\left(677+1\right)\times874-623}\)
\(=\frac{677\times874+251}{677\times874+874-623}\)
\(=\frac{677\times874+251}{677\times874+251}\)
\(=1\)