1.)20/100÷0,8 2.)0.35×4

1)
20/100=1/5 atau 0,2
0,8=4/5
maka :
1/5 : 4/5 = 1/5×5/4=1/4
2)
cara 1
0,35×4=1,4
cara 2
0,35= 7/20
7/20×4/1=7/5
7/5 = 1 2/5

[tex] 1.\frac{20}{100} \div 0.8 \\ = \frac{20}{100} \div \frac{8}{10} \\ = \frac{20}{100} \times \frac{10}{8} \\ = \frac{1}{5} \times \frac{5}{4} \\ = \frac{5}{20} \\ = \frac{1}{4} \\ 2. \: 0.35 \times 4 \\ = 1.4 \\ = \frac{14}{10} \\ = \frac{7}{5} [/tex]