Question

s

0, \frac{11}{3} \cdot -\frac{6}{5}

P) -\frac{3}{17} \cdot \frac{5}{34}

9 \frac{1}{2} \cdot 3 \frac{5}{18}

Bài 5: Tính giá trị

a) \left(-\frac{27}{13}\right) + \left(-\frac{28}{15}\right) + \frac{1}{13} + \left(\frac{7}{-15}\right)

b) \frac{2}{13} + \left(-\frac{12}{15}\right) + \frac{15}{17} + \frac{1}{-25}

c) \frac{1}{7} - \left[ \left( -\frac{3}{11} \right) - \left( \frac{8}{11} - \frac{8}{7} \right) \right]

Answer 1

Bài 5:

a: \(\left(-\frac{27}{13}\right)+\left(-\frac{23}{15}\right)+\frac{1}{13}+\left(\frac{7}{-15}\right)\)

\(=\left(-\frac{27}{13}+\frac{1}{13}\right)+\left(-\frac{23}{15}-\frac{7}{15}\right)\)

\(=-\frac{26}{13}-\frac{30}{15}=-2-2=-4\)

b:Sửa đề: \(\frac{2}{17}+\left(-\frac{12}{25}\right)+\frac{15}{17}+\frac{13}{-25}\)

\(=\left(\frac{2}{17}+\frac{15}{17}\right)-\left(\frac{12}{25}+\frac{13}{25}\right)\)

\(=\frac{17}{17}-\frac{25}{25}=1-1=0\)

c: \(\frac17-\left\lbrack\left(-\frac{3}{11}\right)-\left(\frac{8}{11}-\frac87\right)\right\rbrack\)

\(=\frac17-\left\lbrack-\frac{3}{11}-\frac{8}{11}+\frac87\right\rbrack\)

\(=\frac17-\left\lbrack\frac87-1\right\rbrack=\frac17-\frac17=0\)

Bài 4:

o: \(1\frac13\cdot\frac{-6}{5}=\frac43\cdot\frac{-6}{5}=-\frac{24}{15}=-\frac85\)

p: \(\frac{-3}{17}:\frac{-5}{34}=\frac{3}{17}\cdot\frac{34}{5}=\frac{3\cdot2}{5}=\frac65\)

q: \(1\frac29:3\frac{5}{18}=\frac{11}{9}:\frac{59}{18}=\frac{11}{9}\cdot\frac{18}{59}=\frac{11\cdot2}{59}=\frac{22}{59}\)