tính: 230+4+3/10+7/100
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C,\(230+4+\frac{3}{10}+\frac{7}{100}\)
\(=230+4+0,3+0,07\)
\(=234+0,3+0,07\)
\(=234,3+0,07\)
\(=234,37\)
D,\(500+7+\frac{9}{1000}\)
\(=500+7+0,009\)
\(=507+0,009\)
\(=507,009\)
Bai 2
C1 ( 2,04 + 3,4 ) : 0,68
= 5,44 : 0,68
= 8
C2 ( 2,04 + 3,4 ) : 0,68
= 2,04 : 0,68 + 3,4 : 0,68
= 3 + 5
= 8
c)234+\(\frac{3}{10}\)+\(\frac{7}{100}\)
=234+0,3+0,07
=234,37
d)507+\(\frac{9}{1000}\)
=507+0,009
=507,009
bài 2:
c1:(2,04+3,4):0,68
=5,44:0,68
=8
c2:(2,34+3,4):0,68
=2,34:0,68+3,4:0,68
=3+5
=8
\(\frac{\left(13\frac{1}{4}-2\frac{5}{7}-10\frac{5}{6}\right).230\frac{1}{25}+46\frac{3}{4}}{\left(1\frac{3}{10}+\frac{10}{3}\right):\left(12\frac{1}{3}-14\frac{2}{7}\right)}=\frac{\left(\frac{53}{4}-\frac{19}{7}-\frac{65}{6}\right).\frac{5751}{25}+\frac{187}{4}}{\left(\frac{13}{10}+\frac{10}{3}\right):\left(\frac{37}{3}-\frac{100}{7}\right)}\)
\(=\frac{\left(\frac{1113}{84}-\frac{228}{84}-\frac{910}{84}\right).\frac{5751}{25}+\frac{187}{4}}{\left(\frac{39}{30}+\frac{100}{30}\right):\left(\frac{259}{21}-\frac{300}{21}\right)}\)
\(=\frac{\frac{-25}{84}.\frac{5751}{25}+\frac{187}{4}}{\frac{139}{30}:\frac{-41}{21}}\)
\(=\frac{\frac{-1917}{28}+\frac{1309}{28}}{\frac{139}{30}.\frac{-21}{41}}\)
\(=\frac{\frac{-608}{28}}{\frac{-973}{410}}=\frac{-152}{7}.\frac{410}{-973}=\frac{62320}{6811}\)