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Thứ tự từ lớn đến bé là :
\(\frac{13}{8};\frac{3}{2};\frac{8}{9};\frac{5}{6};\frac{1}{3}\)
a) \(\frac{3}{7};\frac{1}{3};\frac{1}{7}\)
b) \(\frac{7}{1};\frac{3}{1};\frac{7}{3}\)
a) 4/5 x ( 5/4 - 5/7 )
= 4/5 x 15/28
= 21
b) 5/8 x 9/7 + 5/8 x 5/7
= 5/8 x ( 9/7 + 5/7 )
= 5/8 x 2
= 5/4
a, 4/5 x ( 5/4 - 5/7)
=(4/5 x 5/4)- (4/5-5/7)
=1-4/7
=3/7
b, 5/8 x 9/7 -5/8 x 5/7
=5/8 x (9/7 - 5/7 )
=5/8 x 4/7
=5/14
2/3 +5/9 - 3/4 =17/36
2/7 :2/3 -1/7 = 2/7
2/5 * 1/4 :3/8 = 4/15 nha bạn
3/5 + 2/3 + 4/5
=19/15 + 4/5
=31/15
4/9 - 3/14 : 4/7
=4/9 - 3/8
=5/72
Nhớ tích mk nhé !
\(\frac{3}{5}+\frac{2}{3}+\frac{4}{5}=\left(\frac{3}{5}+\frac{4}{5}\right)+\frac{2}{3}\)
=\(\frac{7}{5}+\frac{2}{3}=\frac{21}{15}+\frac{10}{15}=\frac{31}{15}\)
\(\frac{4}{9}-\frac{3}{14}:\frac{4}{7}=\frac{4}{9}-\frac{3}{14}.\frac{7}{4}\)
=\(\frac{4}{9}-\frac{3}{8}=\frac{32}{72}-\frac{27}{72}=\frac{5}{72}\)
\(\frac{9}{10}+\frac{7}{9}+\frac{5}{8}+\frac{3}{7}+\frac{3}{5}+\frac{2}{5}+\frac{4}{7}+\frac{3}{8}+\frac{2}{9}+\frac{1}{10}\)\(\frac{1}{10}\)
= ( 9/10 + 1/10 ) + ( 7/9 + 2/9 ) + ( 5/8 + 3/8 ) + ( 3/7 + 4/7 ) + ( 3/5 + 2/5 )
= 1 + 1 + 1 + 1 + 1
= 1 x 5
= 5
\(\left(\frac{9}{10}+\frac{1}{10}\right)+\left(\frac{7}{9}+\frac{2}{9}\right)+\left(\frac{5}{8}+\frac{3}{8}\right)+\left(\frac{3}{7}+\frac{4}{7}\right)+\left(\frac{3}{5}+\frac{2}{5}\right)\)2/5)
=1+1+1+1+1=5
.
5/4 , 4/4 , 8/9 , 5/9
5/4; 4/4; 8/9; 5/9 nha