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\(9-\frac{13}{4}+\frac{4}{3}\div2=\frac{36}{4}-\frac{13}{4}+\frac{4}{3}\times\frac{1}{2}\)
\(=\frac{23}{4}+\frac{2}{3}\)
\(=\frac{77}{12}\)
\(\frac{5}{3}\)x 2 + x : \(\frac{4}{3}\)= \(\frac{29}{7}\)
\(\frac{10}{3}\)+ x : \(\frac{4}{3}\)= \(\frac{29}{7}\)
x : \(\frac{4}{3}\)= \(\frac{29}{7}\)- \(\frac{10}{3}\)
x = \(\frac{17}{21}\)x \(\frac{4}{3}\)
x = \(\frac{68}{63}\)
\(\frac{10}{3}+\frac{x.3}{4}=\frac{29}{7}\)
\(\frac{3x}{4}=\frac{29}{7}-\frac{10}{3}=\frac{17}{21}\)
\(x=\frac{68}{63}\)
a, \(\frac{5}{7}+\frac{8}{7}=\frac{13}{7}\)
b,\(\frac{9}{8}-\frac{3}{8}=\frac{6}{8}\)
c,\(\frac{6}{1}:\frac{6}{5}=\frac{6}{1}\cdot\frac{5}{6}=\frac{30}{6}=5\)
~~~Hok tốt ~~~
a,\(\frac{13}{7}\)
b,\(\frac{6}{8}\)= \(\frac{3}{4}\)
c,\(\frac{9}{7}\)
d,5
\(a,\)\(\frac{1}{1\times2}+\frac{1}{2\times3}+.......+\frac{1}{99\times100}\)
\(=1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+........+\frac{1}{99}-\frac{1}{100}\)
\(=1-\frac{1}{100}\)
\(=\frac{99}{100}\)
\(b,\)\(\sqrt{4}+\sqrt[3]{8}+\frac{2}{3}\)
\(=2+2+\frac{2}{3}\)
\(=4+\frac{2}{3}\)
\(=\frac{14}{3}\)
\(\frac{3}{5}+\frac{2}{7}=\frac{21}{35}+\frac{10}{35}=\frac{31}{35}\)
\(\frac{3}{9}-\frac{1}{5}=\frac{15}{45}-\frac{9}{45}=\frac{6}{45}\)
\(\frac{2}{5}\times\frac{3}{7}=\frac{6}{35}\)
\(\frac{4}{9}:\frac{2}{5}=\frac{4}{9}\times\frac{5}{2}=\frac{20}{18}\)
Trả lời
\(\frac{3}{5}+\frac{2}{7}=\frac{21}{35}+\frac{10}{35}=\frac{31}{35}\)
\(\frac{3}{9}-\frac{1}{5}=\frac{15}{45}-\frac{9}{45}=\frac{6}{45}=\frac{2}{15}\)
\(\frac{2}{5}\times\frac{3}{7}=\frac{6}{35}\)
\(\frac{4}{9}:\frac{2}{5}=\frac{4}{9}\times\frac{5}{2}=\frac{20}{18}=\frac{10}{9}\)
Study well
a/480000kg=4800ta
b/756224:12=63018 du8
c/x:12=124458
x=124458.12
x=1493496
d/2540000dag=254000
\(1,\frac{3}{5}+\frac{7}{2}-\frac{4}{7}=\frac{42}{70}+\frac{245}{70}-\frac{40}{70}=\frac{247}{70}\)
\(2,\frac{4}{5}-\frac{1}{3}+\frac{3}{4}=\frac{48}{60}-\frac{20}{60}+\frac{45}{60}=\frac{73}{60}\)
\(3,\frac{1}{3}\times\frac{5}{7}:\frac{7}{2}=\frac{5}{21}:\frac{7}{2}=\frac{10}{147}\)
\(4,\frac{1}{2}:\frac{2}{7}\times\frac{4}{7}=\frac{7}{4}\times\frac{4}{7}=1\)
\(5,\frac{19}{15}\times\frac{3}{7}:\frac{4}{9}=\frac{19}{35}:\frac{4}{9}=\frac{171}{140}\)
\(6,\frac{11}{3}:\frac{9}{16}:\frac{3}{8}=\frac{176}{27}:\frac{3}{8}=\frac{1408}{81}\)
_Chúc bạn học tốt _
Đáp án là A