a.25%dikali3/4,b.2,5dikali75%,c.lima1/3dikalu0,4,d.45%dikali0,5,e.3,25dikali3/5,f.5/6dikali0,3,g.90%dikali0,9,h.0,636dikali empat 1/2,i.0,35dikali80%,j.3/8dikal

semoga membantu yaa, kalau salah maaf

A. 25% x 3/4 =
[tex] = \frac{25}{100} \times \frac{3}{4} \\ = \frac{75}{400} \\ = \frac{75 \div 25}{400 \div 25} (disederhanakan)\\ = \frac{3}{16} [/tex]
B. 2,5 x 75%
[tex] = \frac{25}{10} \times \frac{75}{100} \\ = \frac{1875}{1000} \\ = \frac{1875 \div 125}{1000 \div 125} (sederhanakan) \\ = \frac{15}{8} \\ = 1 \frac{7}{8} [/tex]
C.5 1/3 x 0,4
[tex]5 \frac{1}{3} = \frac{16}{3} \\ maka \\ = \frac{16}{3} \times \frac{4}{10} \\ = \frac{64}{30} \\ = \frac{64 \div 2}{30 \div 2} \\ = \frac{32}{15} \\ = 2 \frac{2}{15} [/tex]
D. 45% x 0,5
[tex] = \frac{45}{100} \times \frac{5}{10} \\ = \frac{225}{1000} \\ = \frac{225 \div 25}{1000 \div 25} \\ = \frac{9}{40} [/tex]
E. 3,25 x 3/5
[tex] = \frac{325}{100} \times \frac{3}{5} \\ = \frac{975}{500} \\ = \frac{975 \div 25}{500 \div 25} \\ = \frac{39}{20} \\ = 1 \frac{19}{20} [/tex]
F. 5/6 x 0,3
[tex] = \frac{5}{6} \times \frac{3}{10} \\ = \frac{15}{60} \\ = \frac{15 \div 15}{60 \div 15} \\ = \frac{1}{4} [/tex]
G. 90% x 0,9
[tex] = \frac{90}{100} \times \frac{9}{10} \\ = \frac{810}{1000} \\ = \frac{810 \div 10}{1000 \div 10} \\ = \frac{81}{100} [/tex]
H. 0,636 x 4 1/2
[tex]4 \frac{1}{2} = \frac{9}{2} \\ maka \\ = \frac{636}{1000} \times \frac{9}{2} \\ = ( \frac{636 \div 4}{1000 \div 4} ) \times \frac{9}{2} \\ = \frac{159}{250} \times \frac{9}{2} \\ = \frac{1431}{500} \\ = 2 \frac{431}{500} [/tex]
I. 0,35 x 80%
[tex] = \frac{35}{100} \times \frac{80}{100} \\ = \frac{35}{100} \times \frac{8}{10} \\ = \frac{280}{1000} \\ = \frac{28}{100} \\ = \frac{28 \div 4}{100 \div 4} \\ = \frac{7}{25} [/tex]
J. 3/8 x 0,83
[tex] = \frac{3}{8} \times \frac{83}{100} \\ = \frac{249}{800} [/tex]
maaf kalau salah