Sagot :
Answer:
- A.
- C.
- B.
- A.
- C.
- A.
- B.
- 5/12
- C.
- 4 7/12
Step-by-step explanation:
1.
[tex] = \frac{9}{12} - \frac{5}{12} \\ = \frac{4}{12} \\ = \frac{1}{3} [/tex]
2.
[tex] = 3 \frac{4}{9} - 1 \frac{6}{9} \\ = (3 - 1) + \frac{4}{9} - \frac{6}{9} \\ = (2 - 1) + \frac{13 - 6}{9} \\ = 1 \frac{7}{9} [/tex]
3.
[tex] = 14 \frac{5}{10} - 12 \frac{9}{10} \\ = (14 - 12 ) + \frac{5}{10} - \frac{9}{10} \\ = (13 - 12) + \frac{15 - 9}{10} \\ = 1 \frac{6}{10} \\ = 1 \frac{3}{5} [/tex]
4.
[tex] = 2 \frac{1}{5} - 1 \frac{1}{4} \\ = (2 - 1) + \frac{1}{5} - \frac{1}{4} \\ = (1 - 1) + \frac{6}{5} - \frac{1}{4} \\ = \frac{24- 5}{20} \\ = \frac{19}{20} [/tex]
5.
[tex] = 5 \frac{1}{2} - 2 \frac{1}{5} \\ = (5 - 2) + \frac{1}{2} - \frac{1}{5} \\ = 3 \frac{5 -2}{10} \\ = 3 \frac{3}{10} [/tex]
6.
[tex] = 8 \times \frac{2}{3} \\ = \frac{8}{1} \times \frac{2}{3} \\ = \frac{16}{3} \\ = 5 \frac{1}{3} [/tex]
7.
[tex] = \frac{4}{5} \times \frac{9}{10} \\ = \frac{2}{5} \times \frac{9}{5} \\ = \frac{18}{25} [/tex]
8.
[tex] = \frac{5}{6} \times \frac{2}{4} \\ = \frac{5}{3} \times \frac{1}{4} \\ = \frac{5}{12} [/tex]
9.
[tex] = \frac{8}{9} \times 1 \frac{2}{3} \\ = \frac{8}{9} \times \frac{5}{3} \\ = \frac{40}{27} \\ = 1 \frac{13}{27} [/tex]
10.
[tex] = 1 \frac{2}{3} \times 2 \frac{3}{4} \\ = \frac{5}{3} \times \frac{11}{4} \\ = \frac{55}{12} \\ = 4 \frac{7}{12} [/tex]