Question

Bài 10:

11. 1/2 - (1/3 + 1/10)

12. 1/12 - (-1/6 - 1/4)

13. 1/2 - (-1)/3 + 1/23 + 1/6

14. 2/5 + (-4/3) + (-1/2)

16. 3/5 + (-4/3) + (-3/4)

17. (-7/2) + (-2/3) + (-3/5)

Answer 1

11: \(=\dfrac{1}{2}-\dfrac{1}{3}-\dfrac{1}{10}=\dfrac{1}{6}-\dfrac{1}{10}=\dfrac{5}{30}-\dfrac{3}{30}=\dfrac{2}{30}=\dfrac{1}{15}\)

12: \(=\dfrac{1}{12}+\dfrac{1}{6}+\dfrac{1}{4}=\dfrac{1}{12}+\dfrac{2}{12}+\dfrac{3}{12}=\dfrac{6}{12}=\dfrac{1}{2}\)

13: \(=\dfrac{1}{2}+\dfrac{1}{3}+\dfrac{1}{6}+\dfrac{1}{23}=\dfrac{1}{23}+1=\dfrac{24}{23}\)

14: \(=\dfrac{2}{5}-\dfrac{4}{3}-\dfrac{1}{2}=\dfrac{12}{30}-\dfrac{40}{30}-\dfrac{15}{30}=-\dfrac{43}{30}\)

Answer 2

11: =112+16+14=112+212+312=612=12=112+16+14=112+212+312=612=12

13: =25−43−12=1230−4030−1530=−4330