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8/9 x 5/4 + 3/5 = 10/9 + 3/5 = 77/45
5/8 + 1/4 = 5/9 + 2/8 = 7/8
1/2 + 5/9 = 9/18 + 5/9 = 14/9
9/8 x 3/4 - 4/7 = 27/32 - 4/7 = 61/224
a) \(\dfrac{8}{9}:\dfrac{4}{5}+\dfrac{3}{5}=\dfrac{8}{9}\times\dfrac{5}{4}+\dfrac{2}{5}=\dfrac{10}{9}+\dfrac{2}{5}=\dfrac{50}{45}+\dfrac{18}{45}=\dfrac{68}{45}\)
b) \(\dfrac{5}{8}+\dfrac{1}{4}=\dfrac{5}{8}+\dfrac{2}{8}=\dfrac{6}{8}=\dfrac{3}{4}\)
c) \(\dfrac{7}{8}\times\dfrac{4}{7}+\dfrac{5}{9}=\dfrac{1}{2}+\dfrac{5}{9}=\dfrac{9}{18}+\dfrac{10}{18}=\dfrac{19}{18}\)
d) \(\dfrac{9}{8}:\dfrac{4}{3}-\dfrac{4}{7}=\dfrac{9}{8}\times\dfrac{3}{4}-\dfrac{4}{7}=\dfrac{27}{32}-\dfrac{4}{7}=\dfrac{61}{244}\)
1+2+3+4+5+6+7+8+9+1+2+3+4+5+6+7+8+9+1+2+3+4+5+6+7+8+9=135
3/8 < 3/5
6/7 < 7/8
9/5 > 3/4
8/9 > 4/9 Nếu đúng thì k cho mình nhé bạn!
\(\dfrac{5}{6}-\dfrac{4}{8}=\dfrac{5}{6}-\dfrac{1}{2}=\dfrac{5}{6}-\dfrac{3}{6}=\dfrac{2}{6}=\dfrac{1}{3}\)
\(\dfrac{2}{9}\times8=\dfrac{2\times8}{9}=\dfrac{16}{9}\)
\(\dfrac{9}{12}:\dfrac{3}{4}=\dfrac{9}{12}\times\dfrac{4}{3}=\dfrac{36}{36}=1\)
1)2/6=14/42 2)5/9=25/45
4/7=24/42 6/5=54/45
3)7/2=28/8 4)4/9=28/63
5/8 =5/8 8/7=72/63
CÁC Ý CÒN LẠI BẠN LÀM NỐT NHÉ
2/6 và 4/7
Mẫu số chung:42
\(\frac{2}{6}=\frac{2\times7}{6\times7}=\frac{14}{42}\);\(\frac{4}{7}=\frac{4\times6}{7\times6}=\frac{24}{42}\)
5/9 và 6/5
Mẫu số chung: 45
\(\frac{5}{9}=\frac{5\times5}{9\times5}=\frac{25}{45}\); \(\frac{6}{5}=\frac{6\times9}{5\times9}=\frac{54}{45}\)
7/2 và 5/8
Mẫu số chung:8
\(\frac{7}{2}=\frac{7\times4}{2\times4}=\frac{28}{8}\);\(\frac{5}{8}\)
4/9 và 8/7
Mẫu số chung: 63
\(\frac{4}{9}=\frac{4\times7}{9\times7}=\frac{28}{63};\frac{8}{7}=\frac{8\times9}{7\times9}=\frac{72}{63}\)
9/4 và 2/6
Mẫu số chung:12
\(\frac{9}{4}=\frac{9\times3}{4\times4}=\frac{27}{12};\frac{2}{6}=\frac{2\times2}{6\times2}=\frac{4}{12}\)
4/3 và 9/4
Mẫu số chung:12
\(\frac{4}{3}=\frac{4\times4}{3\times4}=\frac{16}{12}\);\(\frac{9}{4}=\frac{9\times3}{4\times3}=\frac{27}{12}\)
\(\dfrac{8}{9}+\dfrac{3}{18}=\dfrac{16}{18}+\dfrac{3}{18}=\dfrac{19}{18}\) \(\dfrac{5}{7}-\dfrac{4}{11}=\dfrac{55}{77}-\dfrac{28}{77}=\dfrac{3}{11}\)
\(\dfrac{3}{4}+\dfrac{4}{5}=\dfrac{15}{20}+\dfrac{16}{20}=\dfrac{21}{20}\) \(\dfrac{5}{7}-\dfrac{3}{5}=\dfrac{25}{35}-\dfrac{21}{35}=\dfrac{4}{35}\)
\(\dfrac{7}{9}X\dfrac{3}{4}=\dfrac{7}{9}X\dfrac{3}{4}=\dfrac{7}{12}\) \(\dfrac{8}{3}X\dfrac{21}{4}=\dfrac{8}{3}X\dfrac{21}{4}=14\)
\(\dfrac{12}{7}:\dfrac{1}{4}=\dfrac{12}{7}X\dfrac{4}{1}=\dfrac{48}{7}\) \(\dfrac{7}{2}:\dfrac{9}{4}=\dfrac{7}{2}X\dfrac{4}{9}=\dfrac{14}{9}\)
=\(4x\dfrac{9}{8}=4,5\)
4 : \(\dfrac{8}{9}\) = 4 \(\times\) \(\dfrac{9}{8}\)= \(\dfrac{9}{2}\)