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a)3/3/4
b)7/5/11
c)9/1/2
d)9/1/2
e)23/8/9
g)5/3/7
h)11
i)5/1/10
38/5=7/3/5
107/12=8/11/12
95/21=4/11/21
215/32=6/23/32
chữ đầu là số nguyên k cho mình nha
a) \(\frac{1.3+3.5+5.7+7.9}{3.6+9.10+15.14+21.18}\)
= \(\frac{1.3+3.5+5.7+7.9}{1.3.2.3+3.5.2.3+5.7.2.3+7.9.2.3}\)
= \(\frac{1.3+3.5+5.7+7.9}{1.3.6+3.5.6+5.7.6+7.9.6}\)
= \(\frac{1.3+3.5+5.7+7.9}{6.\left(1.3+3.5+5.7+7.9\right)}=\frac{1}{6}\)
Dấu "." là dấu nhân cấp 2
b) \(\frac{1.2+2.3+3.4+4.5}{3.6+6.9+9.12+12.15}\)
= \(\frac{1.2+2.3+3.4+4.5}{1.2.3.3+2.3.3.3+3.4.3.3+4.5.3.3}\)
= \(\frac{1.2+2.3+3.4+4.5}{1.2.9+2.3.9+3.4.9+4.5.9}\)
= \(\frac{1.2+2.3+3.4+4.5}{9.\left(1.2+2.3+3.4+4.5\right)}=\frac{1}{9}\)
Dấu "." là dấu nhân cấp 2
c) \(\frac{0,3+\frac{3}{7}+\frac{3}{11}}{0,4+\frac{4}{7}+\frac{4}{11}}\)= \(\frac{\frac{3}{10}+\frac{3}{7}+\frac{3}{11}}{\frac{4}{10}+\frac{4}{7}+\frac{4}{11}}\)= \(\frac{3.\left(\frac{1}{10}+\frac{1}{7}+\frac{1}{11}\right)}{4.\left(\frac{1}{10}+\frac{1}{7}+\frac{1}{11}\right)}=\frac{3}{4}\)
\(3\frac{3}{4}\)
\(23\frac{8}{9}\)
\(7\frac{5}{11}\)
\(5\frac{3}{7}\)
\(9\frac{1}{2}\)
\(10\frac{1}{4}\)
\(9\frac{1}{2}\)
\(5\frac{1}{10}\)
kb nha
\(\frac{15}{4}=3\frac{3}{4}\)
\(\frac{215}{9}=23\frac{8}{9}\)
\(\frac{82}{11}=7\frac{5}{11}\)
\(\frac{38}{7}=5\frac{3}{7}\)
\(\frac{57}{6}=9\frac{3}{6}\)
\(\frac{123}{12}=10\frac{3}{12}\)
\(\frac{95}{10}=9\frac{5}{10}\)
\(\frac{51}{10}=5\frac{1}{10}\)