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\(\frac{1996\times1995-996}{1000+1996\times1994}\)
\(=\frac{1996\times\left(1994+1\right)-996}{1996\times1994+1000}\)
\(=\frac{1996\times1994+1996\times1-996}{1996\times1994+1000}\)
\(=\frac{1996\times1994+1996-996}{1996\times1994+1000}\)
\(=\frac{1996\times1994+1000}{1996\times1994+1000}=1\)
\(\frac{1,65\times25+117\times1,65+1,65\times108}{150\times0,25+1,4\times150}\)
\(=\frac{\left(25+117+108\right)\times1,65}{150\times\left(0,25+1,4\right)}\)
\(=\frac{250\times1,65}{150\times1,65}\)
\(=\frac{\left(150+100\right)\times1,65}{150\times1,65}\)
\(=\frac{150\times1,65+100\times1,65}{150\times1,65}\)
\(=\frac{150\times1,65+165}{150\times1,65}=\frac{165}{1}=165\)
\(\frac{1996\cdot1995-996}{1000+1996\cdot1994}\)
\(=\frac{1996\cdot\left(1994+1\right)-996}{1000+1996\cdot1994}\)
\(=\frac{1996\cdot1994+1996-996}{1000+1996\cdot1994}\)
\(=\frac{1996\cdot1994+1000}{1000+1996\cdot1994}=1\)
Dạng toán: Tính nhanh ( vận dụng tính chất kết hợp phân phối giữa phép nhân và phép cộng)
Chúc em học tốt!
1995x1994-1/1993x1995+1994
=1995x[1993+1]-1/1993x1995+1994
=1995x1993+1x1995 -1/1993x1995+1994
=1995x1993+1995-1/1993x1995+1994
=1995x19931994/1993+1995+1994
=1
\(\frac{1995\times1994-1}{1993\times1995+1994}\)
\(=\frac{3978029}{3978029}\)
\(=3978029:3978029\)
\(=1\)
k mik nha bn
thank you very much
1995x1994-1/1993x1995+1994
=1995x[1993+1]-1/1993x1995+1994
=1995x1993+1995x1-1/1993x1995+1994
=1995x1993+1995-1/1993x1995+1994
=1995x1993+1994/1993x1995+1994
=1
\(\frac{1996.1995-996}{1000+1996.1994}=\frac{1996.\left(1994+1\right)-996}{1000+1996.1994}=\frac{1996.1994+1996-996}{1000+1996.1994}\)
\(=\frac{1996.1994+1000}{1000+1996.1994}=1\)
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a, QUY ĐỒNG PHÂN SỐ :
MSC=280
\(\frac{2}{5}\)\(=\)\(\frac{112}{280}\)
\(\frac{4}{7}\)\(=\)\(\frac{160}{280}\)
\(\frac{5}{8}\)\(=\)\(\frac{175}{280}\)
mà \(\frac{112}{280}\)\(< \)\(\frac{160}{280}\)\(< \)\(\frac{175}{280}\)\(=>\)\(\frac{2}{5}\)\(< \)\(\frac{4}{7}\)\(< \)\(\frac{5}{8}\)
k cho anh nha anh mỏi tay quá lên chỉ làm dc câu a tý làm câu b sau
\(\frac{1996\cdot1995-996}{1000+1996\cdot1994}\)
= \(\frac{1996\cdot1994+1996-996}{1000+1996\cdot1994}\)
= \(\frac{1996\cdot1994+1000}{1000+1996\cdot1994}=1\)
a) \(\frac{999}{10000}=\frac{99,9}{1000}>\frac{99}{100}\)
=> kết luận
b) \(1-\frac{97}{99}=\frac{2}{99}>1-\frac{98}{100}=\frac{2}{100}\)
\(\Rightarrow\frac{97}{99}< \frac{98}{100}\)
=> kết luận