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\(\frac{54}{60}-\frac{20}{12}=\frac{-46}{60}=\frac{-23}{30}\)
\(\frac{70}{63}+\frac{23}{12}=\frac{109}{36}\)
Bài 2
\(\frac{54}{62}=\frac{1134}{1302}\)
\(\frac{12}{21}=\frac{744}{1302}\)
k mk nha !!
\(\frac{54}{60}-\frac{20}{12}=\frac{54}{60}-\frac{20\cdot5}{12\cdot5_{ }}=\frac{54}{60}-\frac{100}{60}\)
\(=\frac{-23}{30}\)
Tương tự như thế nhé
\(\frac{12}{20}\)= \(\frac{6}{10}\)= \(\frac{3}{5}\)
\(\frac{3}{4}\)= \(\frac{9}{12}\)= \(\frac{12}{16}\)= \(\frac{15}{20}\)
\(\frac{75}{45}\)= \(\frac{15}{9}\)= \(\frac{5}{3}\)
\(\frac{3}{4}\)= \(\frac{18}{24}\)= \(\frac{12}{16}\)
12/20 = 6/10 = 3/5
3/4 = 9/12 = 12/16 = 15/20
75/45 = 15/9 = 5/3
3/4 = 18/24 = 12/16
Tk mk nha
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\(\frac{21}{8}=2\frac{5}{8};\frac{30}{12}=2\frac{1}{2};\frac{54}{16}=4\frac{1}{1}\)
\(\frac{8}{5}-\frac{18}{27}\)
\(=\frac{8}{5}-\frac{2}{3}\)
\(=\frac{24}{15}-\frac{10}{15}\)
\(=\frac{14}{15}\)
\(\frac{12}{20}-\frac{6}{18}\)
\(=\frac{3}{5}-\frac{1}{3}\)
\(=\frac{9}{15}-\frac{5}{15}\)
\(=\frac{4}{15}\)
\(\frac{8}{24}-\frac{5}{25}\)
\(=\frac{1}{3}-\frac{1}{5}\)
\(=\frac{5}{15}-\frac{3}{15}\)
\(=\frac{2}{15}\)
\(\frac{18}{21}-\frac{12}{27}\)
\(=\frac{6}{7}-\frac{4}{9}\)
\(=\frac{54}{63}-\frac{28}{63}\)
\(=\frac{26}{63}\)
1)8/5-2/3=14/15
2)3/5-1/3=4/15
3)1/3-1/5=2/15
4)6/7-4/9=26/63
Để kết quả của phép tính trên là 0 thì :
\(\frac{32}{46}\)X x - \(\frac{16}{23}\)X \(\frac{21}{23}\)= 0
\(\frac{16}{23}\)X x - \(\frac{16}{23}\)X \(\frac{21}{23}\)= 0
\(\frac{16}{23}\)X ( x - \(\frac{21}{23}\)) = 0
x - \(\frac{21}{23}\)= 0 ( chia cả 2 vế cho \(\frac{16}{23}\))
x = 0 + \(\frac{21}{23}\)
x = \(\frac{21}{23}\)
Vậy x = \(\frac{21}{23}\)
12/14 + 15/20 + 6/7 + 3/4
= ( 12/14 + 6/7 ) + ( 15/20 + 3/4 )
= ( 6/7 + 6/7 ) + ( 3/4 + 3/4 )
= 12/7 + 6/4
= 48/28 + 42/28
= 90/28
= 45/14
Tham khảo nha !!!
\(\frac{2}{26}\)+\(\frac{9}{12}\)+\(\frac{4}{7}\)+\(\frac{9}{21}\)+\(\frac{12}{13}\)+\(\frac{20}{80}\) = \(\frac{1}{13}+\frac{3}{4}+\frac{4}{7}+\frac{3}{7}+\frac{12}{13}+\frac{1}{4}=\left(\frac{1}{13}+\frac{12}{13}\right)+\left(\frac{4}{7}+\frac{3}{7}\right)+\left(\frac{1}{4}+\frac{3}{4}\right)\)
= 1+ 1+ 1= 3
\(\frac{2}{26}+\frac{9}{12}+\frac{4}{7}+\frac{9}{21}+\frac{12}{13}+\frac{20}{80}\)
=\(\frac{1}{13}+\frac{3}{4}+\frac{4}{7}+\frac{3}{7}+\frac{12}{13}+\frac{1}{4}\)
=\(\left(\frac{1}{13}+\frac{12}{13}\right)+\left(\frac{3}{4}+\frac{1}{4}\right)+\left(\frac{4}{7}+\frac{3}{7}\right)\)
= 1 + 1 + 1
= 3
like nha bạn!!!!
54/12:64/12=27/32
56/45x54/51=112/85
56/20+58/21=584/105
21/78-12/78=3/26
a).27/32
b).336/305
c).584/105
d).3/26