* De = x !
5)a)1/4 de 20
[tex]\frac{1.20}{4} = \frac{20}{4} =5[/tex]
b)1/3de9
[tex]\frac{1.9}{3} =\frac{9}{3} =3[/tex]
c)3/5de125
[tex]\frac{3.125}{5} = \frac{375}{5} = 75[/tex]
d)3/7de1/3
[tex]\frac{3.1}{7.3} = \frac{3}{21} = \frac{1}{7}[/tex]
e)1/5de3/8
[tex]\frac{1.3}{5.8} =\frac{3}{40}[/tex]
f)4/7de3/5
[tex]\frac{4.3}{7.5} =\frac{12}{35}[/tex]
*Divisão = repete a primeira fração e multiplica pelo inverso da segunda!
6)a)2/3÷1/5
[tex]\frac{2.5}{3.1} = \frac{10}{3}[/tex]
b)4/7÷3/9
[tex]\frac{4.9}{7.3} =\frac{36}{21} = \frac{12}{7}[/tex]
c)3/4÷5/2
[tex]\frac{3.2}{4.5} = \frac{6}{20} =\frac{3}{10}[/tex]
d)5/21÷3/7
[tex]\frac{5.7}{21.3} =\frac{35}{63}[/tex]
e)10/3÷7/3
[tex]\frac{10.3}{3.7} = \frac{30}{21} = \frac{10}{7}[/tex]
f)4/15÷2/35
[tex]\frac{4.35}{15.2} = \frac{140}{30} = \frac{14}{3}[/tex]
g)7/10÷3/1
[tex]\frac{7.1}{10.3} =\frac{7}{30}[/tex]
h)3/1÷7/10
[tex]\frac{3.10}{1.7} =\frac{30}{7}[/tex]
i)1/5÷1/3
[tex]\frac{1.3}{5.1} =\frac{3}{5}[/tex]
j)3/1÷1/9
[tex]\frac{3.9}{1.1} = \frac{27}{1} =27[/tex]
Espero ter ajudado!
Bons estudos!
