8. Calculati:
4 7
1
a) 4
b) 3.2
3
4
c) 10,5
8!
d) 7.31
5​

Răspuns:

a)

[tex]4\frac{4}{5}=\frac{5*4+4}{5}=\frac{24}{5}[/tex]

[tex]1\frac{7}{8}=\frac{8*1+7}{8}=\frac{15}{8}[/tex]

[tex]4\frac{4}{5}*1\frac{7}{8}=\frac{24}{5}*\frac{15}{8}=\frac{24*15}{5*8}=\frac{360}{40}=9[/tex]

b)

[tex]3\frac{1}{5}=\frac{5*3+1}{5}=\frac{16}{5}[/tex]

[tex]1\frac{3}{4}=\frac{4*1+3}{4}=\frac{7}{4}[/tex]

[tex]3\frac{1}{5}*1\frac{3}{4}=\frac{16}{5}*\frac{7}{4}=\frac{16*7}{5*4}=\frac{112}{20}=\frac{28}{5}[/tex] (am simplificat fracția 112/20 cu 4)

c)

[tex]10\frac{1}{2}=\frac{2*10+1}{10}=\frac{21}{10}[/tex]

[tex]10\frac{1}{2}*5=\frac{21}{10}*5=\frac{21*5}{10}=\frac{105}{10}=\frac{21}{2}[/tex] (am simplificat fracția 105/10 cu 5)

Sper că te-am ajutat!