Răspuns:
1.
1/2 , 2/1 , 7/3 , 23/11 , 5/11 , 15/11 , 4/5.
2.
a)
1:3= 0,(3)= 3/9
1÷1/3 = 1÷3/9 = 1× 9/3 =3
1÷4/8 = 1×8/4 =2
b)
3÷1 = 3/1=3
1/3÷1 = 1/3= 0,(3) = 3/9
4/8÷1 =4/8= 2/4= 1/2 =0,5
inversele*mai putin la ultima ecuatie*
3.
a)
[tex] \frac{a}{b} \div \frac{c}{d} = \frac{1}{3} \div \frac{5}{3} = \frac{1}{3} \times \frac{3}{5} = \frac{1}{5} [/tex]
b)
[tex] \frac{a}{b} \div \frac{c}{d} =2 \frac{1}{3} \div 1 \frac{1}{2} = \frac{7}{3} \times \frac{1}{2} = \frac{7}{6} [/tex]
4.
a)
[tex] \frac{1}{\frac{11}{2} } = 1 \div \frac{11}{2} = 1 \times \frac{2}{11} = \frac{2}{11} [/tex]
b)
[tex] \frac{ \frac{1}{11} }{2} = \frac{1}{11} \div 2 = \frac{1}{11} \times \frac{1}{2 } = \frac{1}{22} [/tex]
c)
[tex] \frac{ \frac{1}{7} }{ \frac{3}{4} } = \frac{1}{7} \div \frac{3}{4} = \frac{1}{7} \times \frac{4}{3} = \frac{4}{21} [/tex]
d)
[tex] \frac{3 \frac{1}{7} }{ \frac{11}{21} } = \frac{ \frac{22}{7} }{ \frac{11}{21} } = \frac{22}{7} \div \frac{11}{21} = \frac{22}{7} \times \frac{21}{11} = 2 \times 3 = 6[/tex]
Sper ca te-am ajutat :)
