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a, \(\frac{6}{7}.\frac{16}{15}.\frac{7}{6}.\frac{21}{32}=\frac{6}{7}.\frac{7}{6}.\frac{16}{15}.\frac{21}{32}\)=\(1.\frac{16}{15}.\frac{21}{32}=\frac{7}{5.2}=\frac{7}{10}\)
Phần b T2
c,\(\frac{7}{4}.\frac{11}{21}+\frac{11}{21}.\frac{5}{4}=\frac{11}{21}.\left(\frac{7}{4}+\frac{5}{4}\right)\)=\(\frac{11}{21}.3=\frac{11}{7}\)
a:\(\frac{5}{6}\)-\(\frac{3}{4}\):2
=\(\frac{5}{6}\)-\(\frac{3}{4}\):\(\frac{2}{1}\)
=\(\frac{5}{6}\)-\(\frac{3}{8}\)
=\(\frac{11}{24}\)
a) \(\frac{5}{6}.\frac{3}{4}:2\)= \(\frac{5}{8}x\frac{1}{2}\)= \(\frac{5}{16}\)
b) \(\frac{2}{5}.\frac{4}{7}:2\)= \(\frac{8}{35}x\frac{1}{2}\)= \(\frac{8}{70}\)
Đúng 100%
C1: 3/7×16/33+16/33×4/7
= 16/33×(3/7+4/7)
= 16/33×7/7
= 16/33×1=16/33
C2: 3/7×16/33+16/33×4/7
= 16/7×3/33+4/33×16/7
= 16/7×(3/33+4/33)
= 16/7×7/33
= 16/33
T i c k cho "chị" nha em! ^o^
a) \(\frac{4}{7}=\frac{16}{28}\)
\(\frac{9}{12}=\frac{3}{4}=\frac{21}{28}\)
b) \(\frac{13}{12}=\frac{39}{36}\)
\(\frac{19}{18}=\frac{38}{36}\)
c) \(\frac{1}{5}=\frac{2}{10}\)
d) \(\frac{1}{3}=\frac{21}{63}\)
\(\frac{2}{7}=\frac{18}{63}\)
\(\frac{4}{9}=\frac{28}{63}\)
a/ 4/7 = 1-3/7 và 9/12 = 1-3/12
vì 3/7>3/12 nên 1-3/7<1-3/12
Vậy 4/7<9/12
b/ 13/12 = 1+1/12 và 19/18 = 1+1/18
Vì 1/12>1/18 nên 13/12>19/18
\(=\frac{16}{15}+\frac{28}{5}+\frac{22}{15}\)
\(=\frac{122}{15}\)
\(\frac{16}{15}+\frac{28}{5}+\frac{44}{15}\\ =\frac{16}{15}+\frac{84}{15}+\frac{44}{15}\\ =\frac{144}{15}\)
\(\frac{2}{3}.\frac{3}{4}.\frac{4}{5}.\frac{5}{6}:\frac{2}{6}+2019\)
=\(\frac{2}{3}.\frac{3}{4}.\frac{4}{5}.\frac{5}{6}.\frac{6}{2}+2019\)
=\(\frac{2.3.4.5.6}{3.4.5.6.2}+2019\)
=\(1+2019\)
=\(2020\)
b . 3/7 . 16/33 + 16/33 . 4/7
= 16/33 . ( 3/7 + 4/7 )
= 16/33 . 7/7
= 16/33 . 1
= 16/33
c2 3/7 . 16/33 + 16/33 . 4/7
= 16/77 + 64/231
= 48/231 + 64/231
= 112/231
= 16/33
chúc em học giỏi !!!
a . 5/24 . 5/12 . 24
= ( 5/24 . 24 ) .5/12
= 5 . 5/12
= 25/12
C2 : 5/24 . 5/12 . 24
= 5/24 . ( 5/12 . 24 )
= 5/24 . 10
= 50/24
= 25/12