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a) \(\frac{3}{5}+\frac{6}{11}+\frac{7}{13}+\frac{5}{11}+\frac{2}{5}+\frac{19}{13}=\left(\frac{3}{5}+\frac{2}{5}\right)+\left(\frac{6}{11}+\frac{5}{11}\right)+\left(\frac{7}{13}+\frac{19}{13}\right)=1+1+2=4\)
b) \(\frac{6}{5}\times\frac{3}{8}+\frac{5}{8}\times\frac{6}{5}-\frac{4}{5}=\frac{6}{5}\times\left(\frac{3}{8}+\frac{5}{8}\right)-\frac{4}{5}=\frac{6}{5}-\frac{4}{5}=\frac{2}{5}\)
c) \(\frac{4\times5\times6\times7\times8}{8\times10\times12\times14\times16}=\frac{1}{2\times2\times2\times2\times2}=\frac{1}{32}\)
a, \(\frac{3}{5}+\frac{6}{11}+\frac{7}{13}+\frac{6}{11}+\frac{2}{5}+\frac{19}{13}\)
\(=\left(\frac{3}{5}+\frac{2}{5}\right)+\left(\frac{7}{13}+\frac{19}{13}\right)+\left(\frac{6}{11}+\frac{6}{11}\right)\)
\(=1+2+\frac{12}{11}\)
\(=3+\frac{12}{11}\)
\(=\frac{45}{11}\)
x=\(\frac{4}{3}\)-\(\frac{3}{8}\)=\(\frac{23}{24}\)
x = \(\frac{4}{5}\)+ \(\frac{7}{6}\)=\(\frac{59}{30}\)
x = \(\frac{21}{8}\): \(\frac{1}{9}\) = \(\frac{189}{8}\)
x = \(\frac{8}{3}\)* 5 = \(\frac{40}{3}\)
chúc bạn học tốt ☻
\(\frac{9}{5}\): \(\frac{7}{6}\)+ \(\frac{3}{2}\): \(\frac{7}{6}\)- \(\frac{8}{5}\)x \(\frac{6}{7}\)
\(\frac{9}{5}\div\frac{7}{6}+\frac{3}{2}\div\frac{7}{6}-\frac{8}{5}\times\frac{6}{7}\)
\(=\frac{9}{5}\times\frac{6}{7}+\frac{3}{2}\times\frac{6}{7}-\frac{8}{5}\times\frac{6}{7}\)
\(=\frac{6}{7}\times\left(\frac{9}{5}+\frac{3}{2}-\frac{8}{5}\right)\)
\(=\frac{6}{7}\times\frac{17}{10}\)
\(=\frac{102}{70}\)
\(=\frac{51}{35}\)
\(\frac{9}{5}:\frac{7}{6}+\frac{3}{2}:\frac{7}{6}-\frac{8}{5}x\frac{6}{7}\)
\(=\frac{9}{5}x\frac{6}{7}+\frac{3}{2}x\frac{6}{7}-\frac{8}{5}x\frac{6}{7}\)
\(=\frac{7}{6}x\left(\frac{9}{5}+\frac{3}{2}-\frac{8}{5}\right)\)
\(=\frac{7}{6}x\frac{17}{10}\)
\(=\frac{119}{60}\)
\(x\)là dấu nhân
a) \(\frac{24}{x}\div\frac{8}{3}=\frac{3}{5}\)
\(\frac{24}{x}\cdot\frac{3}{8}=\frac{3}{5}\)
\(\frac{24}{x}=\frac{3}{5}\div\frac{3}{8}\)
\(\frac{24}{x}=\frac{24}{15}\)
Vậy x = 15
b) Tương tự
Câu 1\(\frac{9}{8}.\frac{9}{3}=\frac{81}{24}\)
Câu 2 \(\frac{19}{5}+\frac{9}{5}=\frac{28}{5}\)
Câu 3 \(\frac{31}{7}:\frac{22}{5}=\frac{31.5}{7.22}=\frac{155}{154}\)
Câu 4 \(\frac{12}{1}-\frac{31}{5}=\frac{60}{5}-\frac{31}{5}=\frac{29}{5}\)
5.(x - 1) + 6.(x - 2) = 5
5x - 5 + 6x - 12 = 5
11x - 17 = 5
11x = 5 + 17
11x = 22
x = 2
3.(x - 2) + 6.(x - 1) = 6
3x - 6 + 6x - 6 = 6
9x - 12 = 6
9x = 6 + 12
9x = 18
x = 2
5 ( x - 1 ) + 6 ( x - 2 ) = 5
<=> 5x - 5 + 6x - 12 = 5
<=> 11x = 22
<=> x = 2
Vậy x = 2
8 × 6/5 = 48/5
48/5