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\(\frac{55}{66}-\frac{14}{21}=\frac{5}{6}-\frac{2}{3}=\frac{5}{6}-\frac{4}{6}=\frac{1}{6}\)
\(\frac{15}{25}+\frac{10}{20}=\frac{3}{5}+\frac{1}{2}=\frac{6}{10}+\frac{5}{10}=\frac{11}{10}\)
b: \(=\dfrac{3}{7}\cdot\dfrac{5}{7}\cdot\dfrac{6}{7}=\dfrac{90}{343}\)
c: \(=\dfrac{4}{9}\cdot\dfrac{5}{9}\cdot\dfrac{3}{7}=\dfrac{20}{189}\)
d: \(=\dfrac{1}{3}\cdot\dfrac{5}{12}\cdot\dfrac{5}{12}=\dfrac{25}{432}\)
a. \(\frac{22}{55}\)+ \(\frac{25}{125}\)+ \(\frac{1020}{5100}\)
= \(\frac{2}{5}\)+ \(\frac{1}{5}\)+ \(\frac{1}{5}\)
= \(\frac{4}{5}\)
B. \(\frac{22}{77}\)+ \(\frac{56}{98}\)+ \(\frac{25}{105}\)
= \(\frac{2}{7}\)+ \(\frac{4}{7}\)+ \(\frac{5}{21}\)
= \(\frac{6}{7}\)+ \(\frac{5}{21}\)
= \(\frac{23}{21}\)
a: 78/42-4/7=13/7-4/7=9/7
100/110-56/88=10/11-7/11=3/11
75/35-11/7+21/49=15/7-11/7+3/7=7/7=1
99/72-15/40-1212/1616=11/8-3/8-3/4=1-3/4=1/4
a=(35+45):2=40
b=(37+42+56):3=45
c=(20+32+24+36):4=28
d=(25+37+30+15+63):5=34
a: \(\dfrac{75}{90}+\dfrac{26}{24}=\dfrac{5}{6}+\dfrac{13}{12}=\dfrac{10}{12}+\dfrac{13}{12}=\dfrac{23}{12}\)
b: \(\dfrac{42}{49}-\dfrac{38}{56}=\dfrac{6}{7}-\dfrac{19}{28}=\dfrac{24}{28}-\dfrac{19}{28}=\dfrac{5}{28}\)
c: \(\dfrac{51}{72}+\dfrac{55}{66}=\dfrac{17}{24}+\dfrac{5}{6}=\dfrac{17}{24}+\dfrac{20}{24}=\dfrac{37}{24}\)
d: \(\dfrac{1313}{1515}-\dfrac{20}{25}=\dfrac{13}{15}-\dfrac{4}{5}=\dfrac{13}{15}-\dfrac{12}{15}=\dfrac{1}{15}\)
\(\dfrac{5}{6}+\dfrac{13}{12}=\dfrac{10}{12}+\dfrac{13}{12}=\dfrac{23}{12}\)
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