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=(5/9+20/18)+(2/7+6/14)
=(5/9+10/9)+(2/7+3/7)
=15/9+5/7
=50/21
\(\frac{5}{9}+\frac{8}{18}+\frac{18}{6}=\frac{5}{9}+\frac{4}{9}+3\)
\(=1+3\)
\(=4\) \(\left(=\frac{4}{1}\right)\)
Nếu đúng kết quả thì tích đúng nha
\(6=\frac{6}{1}=\frac{12}{2}=\frac{24}{4}=\frac{48}{8}=\frac{96}{16}\)
\(5:9=\frac{5}{9}=\frac{10}{18}=\frac{20}{36}=\frac{40}{72}=\frac{80}{144}\)
\(1=\frac{3}{3}=\frac{5}{5}=\frac{7}{7}=\frac{9}{9}=\frac{11}{11}\)
\(0=\frac{0}{7}=\frac{0}{10}=\frac{0}{13}=\frac{0}{16}=\frac{0}{19}\)
Chúc em hok tốt!!!
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 !!!
\(\frac{8}{5}-\frac{18}{27}\)
\(=\frac{8}{5}-\frac{2}{3}\)
\(=\frac{24}{15}-\frac{10}{15}\)
\(=\frac{14}{15}\)
\(\frac{12}{20}-\frac{6}{18}\)
\(=\frac{3}{5}-\frac{1}{3}\)
\(=\frac{9}{15}-\frac{5}{15}\)
\(=\frac{4}{15}\)
\(\frac{8}{24}-\frac{5}{25}\)
\(=\frac{1}{3}-\frac{1}{5}\)
\(=\frac{5}{15}-\frac{3}{15}\)
\(=\frac{2}{15}\)
\(\frac{18}{21}-\frac{12}{27}\)
\(=\frac{6}{7}-\frac{4}{9}\)
\(=\frac{54}{63}-\frac{28}{63}\)
\(=\frac{26}{63}\)
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
Quy đồng :
\(a,\frac{4}{5},\frac{7}{9}\)
\(b,\frac{5}{6},\frac{17}{18}\)
\(c,\frac{3}{8},\frac{7}{12}\)
A ) 4 / 5 = 4 x 9 / 5 x 9 = 36 / 45
7 / 9 = 7 x 5 / 9 x 5 = 35/ 45
B ) 5 / 6 = 5 x 18 / 6 x 18 = 90 / 108
17 / 18 = 17 x 6 / 18 x 6 = 102 / 108
C ) 3 / 8 = 3 x 12 / 8 x 12 = 36 / 96
7 / 12 = 7 x 8 / 12 x 8 = 56 / 96
\(\frac{9}{18}\times\frac{5}{6}+\frac{2}{9}\times\frac{15}{12}\)
=\(\frac{1}{2}\times\frac{5}{6}+\frac{2}{9}\times\frac{5}{4}\)
=\(\frac{5}{12}+\frac{10}{36}\)
=\(\frac{15}{36}+\frac{10}{36}\)
=\(\frac{25}{36}\)
nhớ tk nha bạn
mk lộn
6/5.(5/9+18/20)
=6/5.131/90
=131/75
k mk nha
6/5.(5/9+18/20)
=6/5.131/90
=239/90