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a.6/8 * 7/6
=6*7/8*6
=42/48
=21/24(rut gọn)
=7/8(rút gọn)
b.6*7/9
=6*7/9
=42/9
=14/3(rút gọn)
c.4/6 : 8/2
=4/6 * 2/8
=4*2/6*8
=8/48
=4/12=2/6=1/3(rut gọn)
Đúng thì k cho mình nha
a)\(\frac{6}{8}\times\frac{7}{6}=\frac{6\times7}{8\times6}=\frac{42}{48}=\frac{7}{8}\)
b)\(6\times\frac{7}{9}=\frac{6}{1}\times\frac{7}{9}=\frac{6\times7}{1\times9}=\frac{42}{9}=\frac{14}{3}\)
c)\(\frac{4}{6}\div\frac{8}{2}=\frac{4}{6}\times\frac{2}{8}=\frac{4\times2}{6\times8}=\frac{8}{48}=\frac{1}{6}\)
#Học tốt!!!
~NTTH~
a, \(\frac{5}{11}\times\frac{7}{25}+\frac{15}{11}\times\frac{1}{5}\)
\(=\frac{5}{11}\times\frac{7}{25}+\frac{5}{11}\times\frac{3}{5}\)
\(=\frac{5}{11}\times\left(\frac{7}{25}+\frac{3}{5}\right)\)
\(=\frac{5}{11}\times\frac{22}{25}\)
\(=\frac{2}{5}\)
b, \(\frac{3}{7}\times\frac{25}{19}-\frac{1}{7}\times\frac{18}{19}\)
\(=\frac{1}{7}\times\frac{75}{19}-\frac{1}{7}\times\frac{18}{19}\)
\(=\frac{1}{7}\times\left(\frac{75}{19}-\frac{18}{19}\right)\)
\(=\frac{1}{7}\times3\)
\(=\frac{3}{7}\)
(12/7x4/13)+(12/14x14/26)+(6/7x2/13)
= 48/91 + 6/13 + 12/91
= 90/91 + 12/91
= 102/91
\(1,\frac{3}{5}+\frac{7}{2}-\frac{4}{7}=\frac{42}{70}+\frac{245}{70}-\frac{40}{70}=\frac{247}{70}\)
\(2,\frac{4}{5}-\frac{1}{3}+\frac{3}{4}=\frac{48}{60}-\frac{20}{60}+\frac{45}{60}=\frac{73}{60}\)
\(3,\frac{1}{3}\times\frac{5}{7}:\frac{7}{2}=\frac{5}{21}:\frac{7}{2}=\frac{10}{147}\)
\(4,\frac{1}{2}:\frac{2}{7}\times\frac{4}{7}=\frac{7}{4}\times\frac{4}{7}=1\)
\(5,\frac{19}{15}\times\frac{3}{7}:\frac{4}{9}=\frac{19}{35}:\frac{4}{9}=\frac{171}{140}\)
\(6,\frac{11}{3}:\frac{9}{16}:\frac{3}{8}=\frac{176}{27}:\frac{3}{8}=\frac{1408}{81}\)
_Chúc bạn học tốt _
40263 x 7 = 281841