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1) \(4\frac{3}{10}=\frac{43}{10};21\frac{7}{100}=\frac{2107}{100};7\frac{39}{100}=\frac{739}{100};6\frac{123}{1000}=\frac{6123}{1000}\)
2)\(a,5\frac{2}{10}+7\frac{1}{10}=\frac{52}{10}+\frac{71}{10}=\frac{123}{10}\)
\(b,5\frac{6}{7}-3\frac{5}{7}=\frac{41}{7}-\frac{26}{7}=\frac{15}{7}\)
\(c,8\frac{3}{5}x2\frac{6}{7}=\frac{43}{5}x\frac{20}{7}=\frac{172}{7}\)
\(d,1\frac{3}{10}:5\frac{7}{8}=\frac{13}{10}:\frac{47}{8}=\frac{13}{10}x\frac{47}{8}=\frac{611}{80}\)
3) \(7\frac{9}{10}và4\frac{9}{10}\)
Ta có: \(7\frac{9}{10}=\frac{79}{10};4\frac{9}{10}=\frac{49}{10}\)
Suy ra: \(\frac{79}{10}>\frac{49}{10}hay7\frac{9}{10}>4\frac{9}{10}\)
\(6\frac{3}{10}và6\frac{5}{9}\)
Ta có: \(6\frac{3}{10}=\frac{63}{10};6\frac{5}{9}=\frac{59}{9}\)
Suy ra: \(\frac{63}{10}>\frac{59}{9}hay6\frac{3}{10}>6\frac{5}{9}\)
\(2+\frac{3}{10}+\frac{4}{100}\) \(23+\frac{5}{1000}\)
\(=\frac{200}{100}+\frac{30}{100}+\frac{4}{100}\) \(=\frac{23000}{1000}+\frac{5}{1000}\)
\(=\frac{234}{100}=2,34\) \(=\frac{23005}{1000}=23,005\)
\(11+\frac{7}{10}\) \(\frac{6}{10}+\frac{2}{100}\)
\(=\frac{110}{10}+\frac{7}{10}\) \(=\frac{60}{100}+\frac{2}{100}\)
\(=\frac{117}{10}=11,7\) \(=\frac{62}{100}=0,62\)
TL :
a) 8,2
b) 36,23
c) 54,07
d) 12,254
Chúc bn hok tốt ~
a)\(\frac{27}{5}\text{x}\frac{91}{12}\text{x}\frac{125}{9}\text{x}\frac{96}{13}=\frac{27}{9}\text{x}\frac{91}{13}\text{x}\frac{125}{5}\text{x}\frac{96}{12}=3\text{x}7\text{x}25\text{x}8\)
Đến đây tự tính nha !
b)\(\frac{2539}{35}\text{x}\frac{7}{90}+\frac{561}{35}\text{x}\frac{7}{90}=\frac{7}{90}\text{x}\left(\frac{2539}{35}+\frac{561}{35}\right)=\frac{7}{90}\text{x}\frac{3100}{35}=\frac{3100}{90}\text{x}\frac{7}{35}=\frac{310}{9}\text{x}\frac{1}{5}=\frac{62}{9}\)
\(4\frac{2}{10}m=\frac{42}{10}m\)
\(3\frac{12}{100}m=\frac{312}{100}m\)
\(2\frac{2}{25}kg=2\frac{8}{100}kg=\frac{208}{100}kg\)
\(4\frac{2}{10}m=4,2m\)
\(3\frac{12}{100}m=3,12m\)
\(2\frac{2}{25}kg=2,08kg\)
\(\frac{1}{4}\)
\(=\frac{1\times25}{4\times25}\)
\(=\frac{25}{100}\)
\(=25:100\)
\(=0,25\)
Viết các số sau dười dạng số thập phân
7/10
7/100
\(6\frac{38}{100}\)
2014/1000
3/2
2/5
5/8
\(1\frac{1}{4}\)
7/10 = 0,7
7/100 = 0,07
6 38/100 = 638/100 = 6,38
2014/1000 = 2,014
3/2 = 15/10 = 1,5
2/5 = 4/10 = 0,4
5/8 = 625/1000 = 0,625
1 1/4 = 5/4 = 125/100 =1,25
7/10=0,7
7/100=0,07
\(6\frac{38}{100}\)=319/50=6,38
2014/1000=2,014
3/2=1,5
2/5=0,4
5/8=0,625
\(1\frac{1}{4}\)=5/4=1,25
3 : 7 = 3 7 ; 4∶9 = 4 9 ; 23∶6 = 23 6
25 : 100 = 25 100 ; 100∶33 = 100 33 ; 10∶31 = 10 31